Program Evaluation in Medical Education: An Overview of the Utilization-focused Approach

Medical school administrators, educators, and other key personnel must often make difficult choices regarding the creation, retention, modification, or termination of the various programs that take place at their institutions. Program evaluation is a data-driven strategy to aide decision-makers in determining the most appropriate outcome for programs within their purview. The purpose of this brief article is to describe one program evaluation model, the utilization-focused approach. In particular, we address the focus of this model, the personal factor, the role of the evaluator, and the evaluation process. Based on the flexibility of this model as well as its focus on stakeholder involvement, we encourage readers to consider the utilization-focused approach when evaluating programs

The reliability horizon for semi-classical quantum gravity: Metric fluctuations are often more important than back-reaction

In this note I introduce the notion of the ``reliability horizon'' for semi-classical quantum gravity. This reliability horizon is an attempt to quantify the extent to which we should trust semi-classical quantum gravity, and to get a better handle on just where the Planck regime resides. I point out that the key obstruction to pushing semi-classical quantum gravity into the Planck regime is often the existence of large metric fluctuations, rather than a large back-reaction. There are many situations where the metric fluctuations become large long before the back-reaction is significant. Issues of this type are fundamental to any attempt at proving Hawking's chronology protection conjecture from first principles, since I shall prove that the onset of chronology violation is always hidden behind the reliability horizon.Comment: 6 pages; ReV_TeX 3.0; two-column format. Revisions: Central definitions and results essentially unchanged. Discussion of the relationship between this letter and the Kay-Radzikowski-Wald singularity theorems greatly extended and clarified. Discussion of reliability horizon near curvature singularities modified. Several references added. Minor typos fixed. Technical TeX modification

Ncera-101 Station Report from Kennedy Space Center, FL, USA (April 2017)

This is our annual report to the NCERA-101 meeting on the past year's activities related to controlled environment monitoring, operations and testing

“The good guys are doing it anyway”: the accommodation of environmental concern among English and Welsh farmers

Farmers today are increasingly facing pressure from policy and market forces to improve their environmental performance. Yet – despite widespread recognition of the negative externalities of agriculture on a national and global scale – many farmers would argue that, as “custodians of the countryside” they have always respected and cared for the local environment, and play a central role in creating and maintaining the countryside as we know it today. In this paper, we use evidence emerging from research with farmers across England and Wales to explore farmer accounts of environmental concern and action in the context of both traditional farming values and contemporary imperatives. We draw particularly on scholarly work around constructs of “good farming” to consider the extent to which environmental concern has been accommodated within a wide range of farming contexts across England and Wales. Our findings highlight an intrinsic sense of care towards the environment among farmers and reveal how environmental management has in many ways become an integral part of farming discourse; recognised as synergistic with personal and business goals concerning (i) personal respect for the environment and conservation; (ii) countryside custodianship; (iii) farm legacy and succession; (iv) “good” agricultural practice and compliance with regulation; and/or (v) financial profitability. We discuss some of the issues arising from our findings and offer our thoughts on implications for efforts to encourage farmers to carry out environmentally beneficial activities. Whilst expressions of environmental concern do not necessarily equate to effective action on the ground, recognising that many farmers believe environmental management to be part of good farming practice provides a more positive foundation for engaging with them on this topic than assuming they need to be cajoled into action

Evolution of Salmonella enterica serotype Typhimurium driven by anthropogenic selection and niche adaptation

Salmonella enterica serotype Typhimurium (S. Typhimurium) is a leading cause of gastroenteritis and bacteraemia worldwide, and a model organism for the study of host-pathogen interactions. Two S. Typhimurium strains (SL1344 and ATCC14028) are widely used to study host-pathogen interactions, yet genotypic variation results in strains with diverse host range, pathogenicity and risk to food safety. The population structure of diverse strains of S. Typhimurium revealed a major phylogroup of predominantly sequence type 19 (ST19) and a minor phylogroup of ST36. The major phylogroup had a population structure with two high order clades (α and β) and multiple subclades on extended internal branches, that exhibited distinct signatures of host adaptation and anthropogenic selection. Clade α contained a number of subclades composed of strains from well characterized epidemics in domesticated animals, while clade β contained multiple subclades associated with wild avian species. The contrasting epidemiology of strains in clade α and β was reflected by the distinct distribution of antimicrobial resistance (AMR) genes, accumulation of hypothetically disrupted coding sequences (HDCS), and signatures of functional diversification. These observations were consistent with elevated anthropogenic selection of clade α lineages from adaptation to circulation in populations of domesticated livestock, and the predisposition of clade β lineages to undergo adaptation to an invasive lifestyle by a process of convergent evolution with of host adapted Salmonella serotypes. Gene flux was predominantly driven by acquisition and recombination of prophage and associated cargo genes, with only occasional loss of these elements. The acquisition of large chromosomally-encoded genetic islands was limited, but notably, a feature of two recent pandemic clones (DT104 and monophasic S. Typhimurium ST34) of clade α (SGI-1 and SGI-4)

Special Relativistic Simulations of Magnetically-dominated Jets in Collapsing Massive Stars

We perform a series of two-dimensional magnetohydrodynamic core-collapse simulations of rapidly rotating and strongly magnetized massive stars. To study the properties of magnetic explosions for a longer time stretch of postbounce evolution, we develop a new code under the framework of special relativity including a realistic equation of state with a multiflavor neutrino leakage scheme. Our results show the generation of the magnetically-dominated jets in the two ways. One is launched just after the core-bounce in a prompt way and another is launched at $\sim 100$ ms after the stall of the prompt shock. We find that the shock-revival occurs when the magnetic pressure becomes strong, due to the field wrapping, enough to overwhelm the ram pressure of the accreting matter. The critical toroidal magnetic fields for the magnetic shock-revival are found to be universal of $\sim 10^{15}\mathrm{G}$ behind the jets. We point out that the time difference before the shock-revival has a strong correlation with the explosions energies. Our results suggest that the magnetically dominated jets are accompanied by the formation of the magnetars. Since the jets are mildly relativistic, we speculate that they might be the origin of some observed X-ray flashes.Comment: 50 pages, 14 figures, Accepted to ApJ, A paper with high-resolution figures available at http://www-utap.phys.s.u-tokyo.ac.jp/~takiwaki/res/index-j.htm

Magnetic Tower Outflows from a Radial Wire Array Z-pinch

We present the first results of high energy density laboratory astrophysics experiments which explore the evolution of collimated outflows and jets driven by a toroidal magnetic field. The experiments are scalable to astrophysical flows in that critical dimensionless numbers such as the Mach number, the plasma beta and the magnetic Reynolds number are all in the astrophysically appropriate ranges. Our experiments use the MAGPIE pulsed power machine and allow us to explore the role of magnetic pressure in creating and collimating the outflow as well as showing the creation of a central jet within the broader outflow cavity. We show that currents flow along this jet and we observe its collimation to be enhanced by the additional hoop stresses associated with the generated toroidal field. Although at later times the jet column is observed to go unstable, the jet retains its collimation. We also present simulations of the magnetic jet evolution using our two-dimensional resistive magneto-hydrodynamic (MHD) laboratory code. We conclude with a discussion of the astrophysical relevance of the experiments and of the stability properties of the jet.Comment: Accepted by MNRAS. 17 pages without figures. Full version with figures can be found at http://www.pas.rochester.edu/~afrank/labastro/MF230rv.pd

Magnetic Nested-wind Scenarios for Bipolar Outflows: Pre-planetary and YSO nebular shaping

We present results of a series of magnetohydrodynamic (MHD) and hydro- dynamic (HD) 2.5D simulations of the morphology of outflows driven by nested wide-angle winds - i.e. winds which eminate from a central star as well as from an orbiting accretion disk. While our results are broadly relevent to nested wind systems we have tuned the parameters of the simulations to touch on issues in both Young Stellar Objects and Planetary Nebula studies. In particular our studies connect to open issues in the early evolution of Planetary Nebulae. We find that nested MHD winds exhibit marked morphological differences from the single MHD wind case along both dimensions of the flow. Nested HD winds on the other hand give rise mainly to geometric distortions of an outflow that is topologically similar to the flow arising from a single stellar HD wind. Our MHD results are insensitive to changes in ambient temperature between ionized and un-ionized circumstellar environments. The results are sensitive to the relative mass-loss rates, and to the relative speeds of the stellar and disk winds. We also present synthetic emission maps of both nested MHD and HD simulations. We find that nested MHD winds show knots of emission appearing on-axis that do not appear in the HD case.Comment: 28 pages, 8 figure

Individual Tree Data Standard

It is estimated that 40 million trees in the UK have been surveyed and the data stored in local authority databases. Data for just 1.1 million of these trees are included in the UK’s and world’s largest open-access tree database, Treezilla (https://treezilla.org/). Tree surveys are carried out for different purposes and often to different specifications. Many tree data collection protocols and methods overlap in their recommendations but differences between them make it difficult or impossible to compare, combine, or reuse data. To address these problems in 2019 the COMMUNITREE project partners drafted a new data standard for surveys of individual trees. The steps taken to develop the data standard are described in detail here: https://www.forestresearch.gov.uk/research/quantification-and-valuation-of-benefits-provided-by-urban-trees/individual-tree-data-standard/ . Standardised tree data collection and recording will enable people to easily share their data so that a single dataset can be recycled for many purposes. The Individual Tree Data Standard is a partnership between Forest Research, The Open University, Treework Environmental Practice, Natural Apptitude and was funded by Innovate UK and the Geospatial Commission

A classification of the effective metric in nonlinear electrodynamics

We show that only two types of effective metrics are possible in certain nonlinear electromagnetic theories. This is achieved by using the dependence of the effective metric on the energy-momentum tensor of the background along with the Segr\`e classification of the latter. Each of these forms is completely determined by single scalar function, which characterizes the light cone of the nonlinear theory. We compare this light cone with that of Minkowski in two examples.Comment: Accepted for publication in Classical & Quantum Gravit