428,066 research outputs found

    Scoring the sum of correlated results in analytical proficiency testing

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    In proficiency tests the participants' results are usually converted into scores. In some schemes the participants are required to report the sum of the concentrations of a number of analytes and this total also is converted into a score. In such instances the scoring procedure for the total should be mathematically consistent with that for the separate analytes. When these analytes are determined from a single test portion, however, the errors in the results from a participant are likely to be correlated because some stages of the analysis are common to all of the analytes. For a consistent outcome, the scoring method must take account of such correlation

    Nonlinear dynamic Interactions between flow-induced galloping and shell-like buckling

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    Acknowledgement The research of J.S. is supported by EPSRC Grant EP/J010820/1.Peer reviewedPublisher PD

    Radiation Pressure Feedback in Galaxies

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    We evaluate radiation pressure from starlight on dust as a feedback mechanism in star-forming galaxies by comparing the luminosity and flux of star-forming systems to the dust Eddington limit. The linear LFIR--L'HCN correlation provides evidence that galaxies may be regulated by radiation pressure feedback. We show that star-forming galaxies approach but do not dramatically exceed Eddington, but many systems are significantly below Eddington, perhaps due to the "intermittency" of star formation. Better constraints on the dust-to-gas ratio and the CO- and HCN-to-H2 conversion factors are needed to make a definitive assessment of radiation pressure as a feedback mechanism.Comment: To appear in "Conditions and impact of star formation: New results with Herschel and beyond", Proceedings of the 5th Zermatt ISM symposium. 2 pages, 2 figure

    Hands

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    The Myth of Progress in Jonathan Swift and C. S. Lewis

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    Graduate Textual or Investigativ

    Tori and Heegaard splittings

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    Haken showed that the Heegaard splittings of reducible 3-manifolds are reducible, that is, a reducing 2-sphere can be found which intersects the Heegaard surface in a single simple closed curve. When the genus of the "interesting" surface increases from zero, more complicated phenomena occur. Kobayashi showed that if a 3-manifold M3M^3 contains an essential torus TT, then it contains one which can be isotoped to intersect a strongly irreducible Heegaard splitting surface FF in a collection of simple closed curves which are essential in TT and in FF. In general there is no global bound on the number of curves in this collection. We give conditions under which a global bound can be obtained

    Constructive interval temporal logic in Alf

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    This paper gives an implementation of an interval temporal logic in a constructive type theory, using the Alf proof system. After explaining the constructive approach, its relevance to interval temporal logic and potential applications of our work, we explain the fundamentals of the Alf system. We then present the implementation of the logic and give a number of examples of its use. We conclude by exploring how the work can be extended in the future

    Counselling Foster Parents

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    My interest in this topic is the result of having been a foster parent for a period of one year for a group home for emotionally disturbed teenage boys. When my husband and I undertook this project, we had been married for two years and had one daughter of a year old. The five boys we had during this period ranged in age from eleven to fourteen years. This in itself was a phenomenal adjustment to our way of life. A couple grows with its family, passing through the various stages of development, moving gradually from one experience to the next. In our case, we jumped across a span of ten years from our own child to our youngest foster child, missing that gradual transition of adjustment. Because I had had earlier experience as a caseworker, we were afforded the enriching experience of consistent psychiatric consultation and evaluation. This direction was a most helpful experience because each week seemed to bring some sort of a crisis to be dealt with. Today, more and more children coming in to care appear to be suffering from emotional maladjustment. Perhaps we are aware of this only because we are learning more about foster children and the impact of their separation from their families. Perhaps emotional illness is in fact on teh increase. In any event this is a problem which faces many, many foster families today and it is one which we must face realistically. It is my belief that it is important to at least offer foster parents some help in adjusting to their new way of life for not only does the foster child have to be helped to fit into the new surroundings but the foster parents and their own children need assistance in accepting what is bound to be a somewhat different family atmosphere. There may be some, who, when offered these services, will not be able to accept them or who will not realistically need them, but I feel they should be available, and that we would find a significant portion of the foster population who would benefit by such counselling

    Re-membering and connecting: Decolonizing theology through storytelling

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    This article was originally published in The Prophet -- a journal created by and for the students at the Boston University School of Theology (BUSTH) to amplify the voices of STH students by promoting and sharing a range of perspectives on matters of concern including, but not limited to, spiritual practices, faith communities and society, the nature of theology, and current affairs. It serves as a platform for STH students to share their academic work, theological reflections, and life experiences with one another and the wider community."Boston was never on the radar. After completing a Master’s degree in New York City, the plan... " [EXCERPT

    Are subsets necessary in Martin-Lof type theory?

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    After introducing Martin-Lof's type theory, the paper introduces the rules proposed by various authors for adding subset types to the system, and the justification given for their addition. These justifications are examined, and it is argued that by a combination of lazy evaluation and transformation using the Axiom of Choice that subsets need not be added to the system to make it usable
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