Introduction to Focus Issue: Lagrangian Coherent Structures

The topic of Lagrangian coherent structures (LCS) has been a rapidly growing area of research in nonlinear dynamics for almost a decade. It provides a means to rigorously define and detect transport barriers in dynamical systems with arbitrary time dependence and has a wealth of applications, particularly to fluid flow problems. Here, we give a short introduction to the topic of LCS and review the new work presented in this Focus Issue

Limits on [OIII] 5007 emission from NGC4472's globular clusters: constraints on planetary nebulae and ultraluminous black hole X-ray binaries in globular clusters

We have searched for [OIII] 5007 emission in high resolution spectroscopic data from Flames/Giraffe VLT observations of 174 massive globular clusters (GCs) in NGC4472. No planetary nebulae (PNe) are observed in these clusters, constraining the number of PNe per bolometric luminosity, \alpha<0.8*10^{-7}PN/L_{\odot}. This is significantly lower than the rate predicted from stellar evolution, if all stars produce PNe. Comparing our results to populations of PNe in galaxies, we find most galaxies have a higher \alpha than these GCs (more PNe per bolometric luminosity - though some massive early-type galaxies do have similarly low \alpha). The low \alpha required in these GCs suggests that the number of PNe per bolometric luminosity does not increase strongly with decreasing mass or metallicity of the stellar population. We find no evidence for correlations between the presence of known GC PNe and either the presence of low mass X-ray binaries (LMXBs) or the stellar interaction rates in the GCs. This, and the low \alpha observed, suggests that the formation of PNe may not be enhanced in tight binary systems. These data do identify one [OIII] emission feature, this is the (previously published) broad [OIII] emission from the cluster RZ 2109. This emission is thought to originate from the LMXB in this cluster, which is accreting at super-Eddington rates. The absence of any similar [OIII] emission from the other clusters favors the hypothesis that this source is a black hole LMXB, rather than a neutron star LMXB with significant geometric beaming of its X-ray emission.Comment: 10 pages, 3 figures, accepted for publication in Ap

Translation of lines of Euripides by Thomas Love Peacock

Translation by Thomas Love Peacock of the last five lines of Euripides\u27 Alcestis. An addendum by \u27R. Garnett\u27 (presumably Richard Garnett) notes this. A pencilled note on the verso suggests that the manuscript was given by Garnett to \u27J. Everson\u27 in 1902.https://scholarworks.umt.edu/whicker/1012/thumbnail.jp

A study of post-tenure review *policies among Nevada community colleges and the peer institutions of Ccsn

This study carries forward the research of post-tenure review in selected community colleges. Administrators, faculty leadership, and faculty from the four (4) community colleges in Nevada and the seven (7) peer institutions of the Community College of Southern Nevada (CCSN) participated in this research; A descriptive survey instrument was used that was formatted using Likert-type items. The participants were asked to rate the degree to which they agreed or disagreed with the 27 statements; Statements 1--15 were designed to reflect the participant perceptions on how their institutions post-tenure review procedures comported with the AAUP\u27s MINIMUM STANDARDS FOR GOOD PRACTICES IF A FORMAL SYSTEM OF POST TENURE REVIEW IS ESTABLISHED. Statements 16--20 were to provide information from the participant regarding their perceptions of post-tenure review. There were 45 completed instruments returned out of a possible 65 for a response rate of 69 percent; The statements relating to consistency with the AAUP standards found that generally participants felt the following components of their post-tenure review process fell short of consistency with AAUP standards: (1) Participants generally felt that their post-tenure review was only a reevaluation or revalidation of their tenure status. (2) There was a general feeling that the burden of proof was shifted from administration to the individual faculty members to show cause why he/she should be retained. (3) Only one half of the faculty participants felt there were tangible recognition of those faculty members who had actually demonstrated high or improved performance. (4) Generally, administrators felt they could mandate or impose a developmental program. (5) Only 43 percent of the faculty agreed that other possibilities such as mutually agreeable reassignment to other duties were an option to separation; It was clear from this research that generally there is support for post tenure review in a formative context rather than a summative one; Based on the results of this study and reflection on the implications of these findings, suggestions for a model for post-tenure review for CCSN was formulated and presented.*; *This dissertation is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Adobe Acrobat

Lagrangian Based Methods for Coherent Structure Detection

There has been a proliferation in the development of Lagrangian analytical methods for detecting coherent structures in fluid flow transport, yielding a variety of qualitatively different approaches. We present a review of four approaches and demonstrate the utility of these methods via their application to the same sample analytic model, the canonical double-gyre flow, highlighting the pros and cons of each approach. Two of the methods, the geometric and probabilistic approaches, are well established and require velocity field data over the time interval of interest to identify particularly important material lines and surfaces, and influential regions, respectively. The other two approaches, implementing tools from cluster and braid theory, seek coherent structures based on limited trajectory data, attempting to partition the flow transport into distinct regions. All four of these approaches share the common trait that they are objective methods, meaning that their results do not depend on the frame of reference used. For each method, we also present a number of example applications ranging from blood flow and chemical reactions to ocean and atmospheric flows. (C) 2015 AIP Publishing LLC.ONR N000141210665Center for Nonlinear Dynamic

Manuscript poem by Thomas Love Peacock

Manuscript poem by Thomas Love Peacock from a letter to Lord Broughton, November 13, 1862, on mourning paper. Cf. Nicholas A. Joukovsky, Letters of Thomas Love Peacock, v. 2, 1828-1866, Oxford: Clarendon Press, 2001. Letter no. 327.https://scholarworks.umt.edu/whicker/1011/thumbnail.jp