Self-Similar Collapse Solutions for Cylindrical Cloud Geometries and Dynamic Equations of State

A self-similar formalism for the study of the gravitational collapse of molecular gas provides an important theoretical framework from which to explore the dynamics of star formation. Motivated by the presence of elongated and filamentary structures observed in giant molecular clouds, we build upon the existing body of work on cylindrical self-similar collapse flows by including dynamic equations of state that are different from the effective equation of state that produces the initial density distribution. We focus primarily on the collapse of initial states for which the gas is at rest and everywhere overdense from its corresponding hydrostatic equilibrium profile by a factor $\Lambda$, and apply our results toward the analysis of star formation within dense, elongated molecular cores. An important aspect of this work is the determination of the mass infall rates over a range of the parameters which define the overall state of the gas -- the overdensity parameter $\Lambda$, the index $\Gamma$ of the static equation of state, and the index $\gamma$ of the dynamic equation of state. While most of the parameter space explored in this work leads to solutions for which the underlying equations do not become singular, we do include a discussion on how to treat cases for which solutions pass smoothly through the singular surface. In addition, we also present a different class of collapse solutions for the special case $\gamma = 1$.Comment: Accepted for publication to PAS

Ex-nihilo: Obstacles Surrounding Teaching the Standard Model

The model of the Big Bang is an integral part of the national curriculum for England. Previous work (e.g. Baxter 1989) has shown that pupils often come into education with many and varied prior misconceptions emanating from both internal and external sources. Whilst virtually all of these misconceptions can be remedied, there will remain (by its very nature) the obstacle of ex-nihilo, as characterised by the question `how do you get something from nothing?' There are two origins of this obstacle: conceptual (i.e. knowledge-based) and cultural (e.g. deeply held religious viewpoints). The article shows how the citizenship section of the national curriculum, coming `online' in England from September 2002, presents a new opportunity for exploiting these.Comment: 6 pages. Accepted for publication in Physics E

Supporting Catholic Education through Effective School/University Partnerships: Two Models from the 2012 Catholic Higher Education Collaborative Conference

The following article contains two essays based on presentations to the 2012 CHEC conference on Catholic school governance held at Marquette University in October 2012. The essays outline two models of deep collaboration between Catholic institutions of higher education and Catholic K-12 schools designed to support and foster improvements in Catholic education. The first essay, “Higher Education Working Together to Help Catholic Schools: The Greater Milwaukee Catholic Education Consortium,” written by William A. Henk and Jennifer A. Maney, provides an overview of the Greater Milwaukee Catholic Education Consortium (GMCEC), an ongoing collaborative effort between the archdiocese of Milwaukee and the region’s five Catholic colleges and universities. Building a strong partnership among multiple institutions has allowed the GMCEC to leverage the individual strengths of each member institution to provide a variety of supports to Catholic schools within the diocese. The essay outlines the early history of the collaboration, the key areas of engagement, and some emerging outcomes and ongoing challenges associated with efforts to scaffold supports for diocesan schools. Following this essay are excerpts from a panel discussion among the five presidents of the institutions of higher education that are part of the consortium

Dehalogenation of polychlorinated biphenyls and polybrominated diphenyl ethers using a hybrid bioinorganic catalyst

The environmentally prevalent polybrominated diphenyl ether (PBDE) #47 and polychlorinated biphenyls (PCBs) #28 and #118 were challenged for 24 hours with a novel biomass-supported Pd catalyst (BioPd0). Analysis of the products via GC/MS revealed the BioPd0 to cause the challenged compounds to undergo stepwise dehalogenation with preferential loss of the least sterically hindered halogen atom. A mass balance for PCB #28 showed that it is degraded to three dichlorobiphenyls (33.9 %), two monochlorobiphenyls (12 %), and biphenyl (30.7 %). The remaining mass was starting material. In contrast, while PCB #118 underwent degradation to yield five tetra- and five trichlorinated biphenyls; no less chlorinated products or biphenyl were detected, and the total mass of degraded products was 0.3 %. Although the BioPd0 material was developed for treatment of PCBs, a mass balance for PBDE #47 showed that the biocatalyst could prove a useful method for treatment of PBDEs. Specifically, 10 % of PBDE # 47 was converted to identifiable lower brominated congeners, predominantly the tribrominated BDE 17, and the dibrominated BDE 4, 75 % remained intact, while 15 % of the starting mass was unaccounted for

Preparing humanitarians to address ethical problems.

Infectious disease outbreaks represent potentially catastrophic threats to those affected by humanitarian crises. High transmissibility, crowded living conditions, widespread co-morbidities, and a lack of intensive care capacity may amplify the effects of the outbreak on already vulnerable populations and present humanitarian actors with intense ethical problems. We argue that there are significant and troubling gaps in ethical awareness at the level of humanitarian praxis. Though some ethical guidance does exist most of it is directed at public health experts and fails to speak to the day-to-day ethical challenges confronted by frontline humanitarians. In responding to infectious disease outbreaks humanitarian workers are likely to grapple with complex dilemmas opening the door to moral distress and burnout

The Interest Ecology of Financial Regulation: Interest Group Plurality in the Design of Financial Regulatory Policies

Existing literature has offered a variety of claims regarding why financial regulatory politics features a relative dominance of the regulated financial industry. In this article we explore the broader interest group environment in which financial industry advocacy operates. Using new data on interest group participation in financial regulatory consultations, we provide the first comprehensive analysis of the ecology of interest groups that populate financial regulatory policymaking. Through a new measure of ‘mobilized dissent’ we find evidence that the level of interest group pluralism in financial regulatory policymaking is constrained by the limited mobilization of voices outside of the business community. We analyze how mobilized dissent toward the regulated financial industry changes in response to different institutional environments. While technical complexity, institutional context, and the global financial crisis are found to impact the level of mobilized dissent, the impact of these environmental conditions varies across different groups. This analysis reveals not only that organized opposition to the financial industry is relatively weak but also that it is relatively disjointed

Predicting length of treatment for neonatal abstinence syndrome in methadone-exposed neonates.

OBJECTIVE: The objective of the study was to identify maternal variables predicting length of treatment for neonatal abstinence syndrome (NAS). STUDY DESIGN: This was a retrospective cohort study of infants treated for NAS during 2000-2006 whose mothers were on methadone maintenance at delivery. Mixed-effects linear regression was used to examine the interaction of maternal and neonatal variables with length of treatment. RESULTS: Of 204 neonates born to methadone exposed mothers, the average dose at delivery was 127 mg daily (25-340 mg) with median length of treatment 32 days (1-122 days). Trimester of initial exposure (P = .33), methadone dose at delivery (P = .198), body mass index (P = .31), antidepressant use (P = .40), cigarette use (P = .76), race (P = .78), and maternal age (P = .84) did not predict length of treatment. In the multivariate analysis, gestational age at delivery and benzodiazepine use were significant predictors of length of treatment. CONCLUSION: Later gestational age and concomitant benzodiazepine use were associated with longer treatment