The Gas Temperature of Starless Cores in Perseus

In this paper we study the determinants of starless core temperatures in the Perseus molecular cloud. We use NH3 (1,1) and (2,2) observations to derive core temperatures (T_kin) and data from the COMPLETE Survey of Star Forming Regions and the c2d Spitzer Legacy Survey for observations of the other core and molecular cloud properties. The kinetic temperature distribution probed by NH3 is in the fairly narrow range of 9 - 15 K. We find that cores within the clusters IC348 and NGC1333 are significantly warmer than "field" starless cores, and T_kin is higher within regions of larger extinction-derived column density. Starless cores in the field are warmer when they are closer to class O/I protostars, but this effect is not seen for those cores in clusters. For field starless cores, T_kin is higher in regions in which the 13CO linewidth and the 1.1mm flux from the core are larger, and T_kin is lower when the the peak column density within the core and average volume density of the core are larger. There is no correlation between T_kin and 13CO linewidth, 1.1mm flux, density or peak column density for those cores in clusters. The temperature of the cloud material along the line of sight to the core, as measured by CO or far-infrared emission from dust, is positively correlated with core temperature when considering the collection of cores in the field and in clusters, but this effect is not apparent when the two subsamples of cores are considered separately.Comment: Accepted to ApJ; 13 pages, including 3 tables and three figure

Action research and the study of human being

"Despite the openness of action research to engage with several philosophical movements from the 20th century, there does not seem to be as much engagement with existentialist thought. I try to point out and further articulate certain affinities that I see between action research and existentialist philosophy. I suggest that action research can gain from exploring these connections. Based on the existentialist perspective, I compare action research and more standard social science. In particular, I use Heidegger’s notions of “das Man” and an “existentialist essence” of human being as a key to bringing out these differences and for suggesting ways in which action research may capitalize on such differences." (author's abstract

A Century of Faith and Victory (Original Transcript)

A history of Taylor University written by the Rev. Enoch A Bunner from the class of 1898 and presented in 1946 during the centennial celebration of Taylor University. This is the original typed transcript.https://pillars.taylor.edu/history_books/1043/thumbnail.jp

A Century of Faith and Victory (Later Transcript)

A history of Taylor University written by the Rev. Enoch A Bunner from the class of 1898 and presented in 1946 during the centennial celebration of Taylor University. This is a later transcript of the original transcript. Blank spaces correspond with typoes and unintelligible corrections in the original transcript. The original transcript was from 1946 but this copy appears to be from the 1990s, though there are no dates on this document. It may have been retyped on the occasion of Enoch\u27s death in 1992.https://pillars.taylor.edu/history_books/1044/thumbnail.jp

A NEW GEOMETRIC MODEL AND METHODOLOGY FOR UNDERSTANDING PARSIMONIOUS SEVENTH-SONORITY PITCH-CLASS SPACE

Parsimonious voice leading is a term, first used by Richard Cohn, to describe non-diatonic motion among triads that will preserve as many common tones as possible, while limiting the distance traveled by the voice that does move to a tone or, better yet, a semitone. Some scholars have applied these principles to seventh chords, laying the groundwork for this study, which strives toward a reasonably comprehensive, usable model for musical analysis. Rather than emphasizing mathematical proofs, as a number of approaches have done, this study relies on two- and three-dimensional geometric visualizations and spatial analogies to describe pitch-class and harmonic relationships. These geometric realizations are based on the organization of the neo-Riemannian Tonnetz, but they expand and apply the organizational principles of the Tonnetz to seventh sonorities. It allows for the descriptive “mapping” or prescriptive “navigation” of harmonic paths through a defined space. The viability of the theoretical model is examined in analyses of passages from the repertoire of Frédéric Chopin. These passages exhibit a harmonic syntax that is often difficult to analyze as anything other than “tonally unstable” or “transitional.” This study seeks to analyze these passages in terms of what they are, rather than what they are not