A plasma vortex revisited: The importance of including ionospheric conductivity measurements

In an earlier paper [Kosch et al., 1998], simultaneous all-sky TV imager and Scandinavian Twin Auroral Radar Experiment (STARE) observations of an ionospheric plasma vortex located poleward of an auroral arc were presented. The vortex is associated with a sudden brightening of the arc and corresponds to an ionospheric region of diverging horizontal electric fields, which is equivalent to a downward field-aligned current (FAC), i.e., the closure current for the upward current above the arc. This event has been revisited because of the subsequent availability of data from the Scandinavian Magnetometer Array. These data, combined with STARE electric fields, have been used to determine the real ionospheric conductance distribution throughout the field of view. As a result, a more realistic, quantitative picture of the current system associated with the arc is obtained than was possible in an earlier model based on an assumed constant conductance. In particular, a complete macroscopic electrodynamic description of a plasma vortex, composed of ionospheric conductances, true horizontal currents, and FACs, is obtained for the first time. It is shown that the plasma vortex corresponds to an area of decreased conductance, thus broadening the FAC distribution and reducing the current density compared to the earlier results. The study illustrates that horizontal conductance gradients should not be neglected when computing FACs

Hedging our bets: the expected contribution of species to future phylogenetic diversity

If predictions for species extinctions hold, then the `tree of life' today may be quite different to that in (say) 100 years. We describe a technique to quantify how much each species is likely to contribute to future biodiversity, as measured by its expected contribution to phylogenetic diversity. Our approach considers all possible scenarios for the set of species that will be extant at some future time, and weights them according to their likelihood under an independent (but not identical) distribution on species extinctions. Although the number of extinction scenarios can typically be very large, we show that there is a simple algorithm that will quickly compute this index. The method is implemented and applied to the prosimian primates as a test case, and the associated species ranking is compared to a related measure (the `Shapley index'). We describe indices for rooted and unrooted trees, and a modification that also includes the focal taxon's probability of extinction, making it directly comparable to some new conservation metrics.Comment: 19 pages, 2 figure

The evolution of experiential learning: Tracing lines of research in the JEE

This essay introduces a collection of past articles from the Journal of Experiential Education (JEE) focused on the concept of experiential learning. It outlines the historical trajectory of the concept beginning with human relations training practices beginning in 1946, as it came to be understood as a naturally occurring psychological process and a grounding for pedagogical reforms. The eight articles included in the issue reflect the way JEE authors have contended with problems arising from the concept’s departure from its origins in practice. We suggest that experiential learning’s evolution into a general theory was accomplished by decoupling it from its roots in a particular social practice and ideology, and then focusing on the concept’s technical problems. It is now important for researchers to revisit assumptions underpinning current theory and practice, situate research on experiential learning in wider practical and scholarly traditions, and develop new vocabularies concerning the relationship between experience and learning in educational programs

Static-light mesons on a dynamical anisotropic lattice

We present results for the spectrum of static-light mesons from Nf=2 lattice QCD. These results were obtained using all-to-all light quark propagators on an anisotropic lattice, yielding an improved signal resolution when compared to more conventional lattice techniques. In particular, we consider the inversion of orbitally-excited multiplets with respect to the `standard ordering', which has been predicted by some quark models.Comment: 3 pages with 3 figures. Talk by JF at "Quarks and Nuclear Physics", Madrid 5th-10th June 200

Advanced Restaurant Techniques

This is a food and beverage module. Marks are awarded each week and then at the end of the module students undertake a practical assessment. They also develop a portfolio of what they have done throughout the module and compare that with books/published research of the different techniques/presentations that they have learnt in the form of a reflective diary

My Experiences With and Thoughts About Distance Learning

When I was a full time Instructor at Great Falls COT from 2000 to 2005, the COT pioneered some online and hybrid courses offered in the curriculum, including core courses in mathematics. After a year or so, at least half of my course load was internet driven (including summer offerings), and when I had a pulmonary embolism I taught all Great Falls COT courses (4) from my home in Missoula the following semester. This colloquium is a summary of my experiences, my successes (few), my failures (many), and what I learned from my experiences teaching distance mathematics core courses

Numerical models of jet disruption in cluster cooling flows

We present a coherent picture for the formation of the observed diverse radio morphological structures in dominant cluster galaxies based on the jet Mach number. Realistic, supersonic, steady-state cooling flow atmospheres are evolved numerically and then used as the ambient medium through which jets of various properties are propagated. Low Mach number jets effectively stagnate due to the ram pressure of the cooling flow atmosphere while medium Mach number jets become unstable and disrupt in the cooling flow to form amorphous structures. High Mach number jets manage to avoid disruption and are able to propagate through the cooling flow

Development and the G20

This publication examines what role the G20 can play in international development. Key findings: Development is a key component of the G20, but there are concerns over the effectiveness of the current development agenda. The criticism includes that the development agenda is too diffuse and mostly distant to the G20’s main activities. But the G20 development agenda has made progress in some important areas, including increasing the resources of the international financial institutions, infrastructure, food security, financial inclusion and reducing the cost of remittances. However development and global economic issues cannot be treated in isolation; development must be ‘mainstreamed’ and clearly seen as part of the G20’s core agenda. To the extent that Australia can help strengthen the G20 when it assumes the chair in 2014, and make tangible progress in such areas as - economic growth, financial regulation, trade, financial inclusion, infrastructure and climate change financing – it can make a significant contribution to promoting development and reducing poverty. Authored by Mike Callaghan AM, Annmaree O’Keeffe AM, Robin Davies, Susan Harris Rimmer , Steve Price-Thomas, Sabina Curatolo, Julia Newton-Howes and Michelle Lettie

Modelling soil erosion and transport in the Burrishoole catchment, Newport, Co. Mayo, Ireland

The Burrishoole catchment is situated in County Mayo, on the northwest coast of the Republic of Ireland. Much of the catchment is covered by blanket peat that, in many areas, has become heavily eroded in recent years. This is thought to be due, primarily, to the adverse effects of forestry and agricultural activities in the area. Such activities include ploughing, drainage, the planting and harvesting of trees, and sheep farming, all of which are potentially damaging to such a sensitive landscape if not managed carefully. This article examines the sediment yield and hydrology of the Burrishoole catchment. Flow and sediment concentrations were measured at 8-hourly intervals from 5 February 2001 to 8 November 2001 with an automatic sampler and separate flow gauge, and hourly averages were recorded between 4 July 2002 and 6 September 2002 using an automatic river monitoring system [ARMS]. The authors describe the GIS-based model of soil erosion and transport that was applied to the Burrishoole catchment during this study. The results of these analyses were compared, in a qualitative manner, with the aerial photography available for the Burrishoole catchment to see whether areas that were predicted to contribute large proportions of eroded material to the drainage network corresponded with areas where peat erosion could be identified through photo-interpretation