86,947 research outputs found

    Planetary Nebulae: What can they tell us about close binary evolution?

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    It is now clear that a binary pathway is responsible for a significant fraction of planetary nebulae, and the continually increasing sample of known central binaries means that we are now in a position to begin to use these systems to further our understanding of binary evolution. Binary central stars of planetary nebulae are key laboratories in understanding the formation processes of a wide-range of astrophysical phenomena - a point well-illustrated by the fact that the only known double-degenerate, super-Chandrasekhar mass binary which will merge in less than a Hubble time is found inside a planetary nebula. Here, I briefly outline our current understanding and avenues for future investigation.Comment: To appear in the proceedings of "Physics of Evolved Stars 2015 - A conference dedicated to the memory of Olivier Chesneau" http://poe2015.sciencesconf.org

    Hypermedia for language learning: The FREE model at Coventry University

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    Coventry University is pioneering the integration of hypermedia into the curriculum for the teaching of Italian language and society with the creation of a package based on Nerino Rossi's novel La neve nel bicchiere. The novel was already in use as a basic course text, and developing a hypermedia package was felt to be the ideal way of creating a more stimulating means of access to it. The procedure used in creating the package is described, as are its contents, the ways in which the students use it and the tasks they are given to perform, the feedback from the students, and its impact on their performance. The testing of the prototype has helped in creating a new cognitive model: the FREE (Fluid Role‐Exchange Environment) which functions as a fluid and interactive ‘pool’ where the three main actors, or act ants, ie. the learner, the lecturer and the computer, exchange roles. Within the FREE, students were involved in the construction and evaluation of the courseware, as well as testing the various versions of the prototype. The development and use of hypermedia inside and outside the classroom has made it possible to change both the students’ and the lecturer's attitude towards the material being learnt. However, the courseware does not seem to equip students sufficiently for essay writing, and this problem needs further investigation

    Afrocentric Ideologies and Gendered Resistance in Daughters of the Dust and Malcolm X: Setting, Scene, and Spectatorship

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    This study of scenes from the films Daughters of the Dust and Malcolm X, describes images of myth, gender, and resistance familiar to African-American interpretive communities. Key thematic and technical elements of these films are opposed to familiar Hollywood practices, indicating the directors\u27 effort to address resisting spectators. Both filmmakers, Julie Dash and Spike Lee respectively, chose subjects with an ideological resonance in African-American collective memory: Malcolm X, eulogized by Ossie Davis as our living black manhood (i) and the women of the Gullah Sea Islands, a site often celebrated for its authentically African cultural survivals. Both films combine images of an African past with an American present using a pattern of historically specific myths and tropes

    Idaho: Round 1 - State-Level Field Network Study of the Implementation of the Affordable Care Act

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    This report is part of a series of 21 state and regional studies examining the rollout of the ACA. The national network -- with 36 states and 61 researchers -- is led by the Rockefeller Institute of Government, the public policy research arm of the State University of New York, the Brookings Institution, and the Fels Institute of Government at the University of Pennsylvania.Idaho is by some accounts one of the most conservative states in the country, yet it is the only state led by a Republican governor and a Republican legislature that chose to create a health insurance exchange as part of the Affordable Care Act's (ACA) implementation. The state has decided not to expand Medicaid for the time being, though they may revisit this decision in the future

    A map-based place-browser for a PDA

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    This article describes PlaceBrowser, a PDA based application that allows the user of the application to navigate around an area of geographical interest, such as a city, using a zoomable, panable hierarchy of aerial images, in a fashion similar to Google Maps. The novel aspect to the work is that an area of precise interest within the map can be pin-pointed by the user by directly dragging out a rectangular area on the map. This forms the source to a spatial search that returns landmarks that are then used to trigger a Web based query. The results of this query are displayed to the user. The net effect is that, in response to dragging out a rectangular area, web pages that are relevant to this area but have not been explicitly geo-spatially tagged with metadata (longitude,latitude) are shown to the user

    Interstate competition and political stability

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    Previous theories of globalization have examined factor mobility’s effect on the political conflict between social classes. But factor mobility also increases competition between state rulers in provid- ing services for citizens. I ask how this interstate competition affects the process of political change. In a simple model, interstate competition substitutes for democracy, by forcing rulers to invest in pub- lic goods so as to avoid capital and labor leaving the country. As a result, citizens are less willing to struggle for democracy, and rulers are less willing to oppose it, when interstate competition is strong. Therefore, there is less conflict over the level of democracy. The theory is tested on a post-war panel of countries, using neighboring countries’ financial openness as a proxy for factor mobility. As the theory predicts, states experience fewer changes in their level of democracy when their neighbors are financially open

    Social class (in)visibility and the professional experiences of middle-class novice teachers

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    This article focuses upon the classed and early professional experiences of middle-class novice teachers in England experiencing and contemplating working in schools serving socio-economically disadvantaged communities. Through an examination of the visibility and invisibility of social class in education set within an increasingly unequal and changed social landscape, the article reports upon research which seeks to better understand the class identities of these teachers. Evidence is presented of the key, yet complex, role that social class occupies within the working lives of new teachers and reveals the different ways in which teachers respond to the classed dimensions of their early professional experiences. It is concluded that the fundamentally important role that social class plays in terms of shaping early professional experiences in teaching suggests the need not only for a commensurately enhanced focus as part of early professional development, but also for attention that is sensitively attuned to the class identities of teachers
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