5,093 research outputs found

    Measurement of the dependence of the light yields of linear alkylbenzene-based and EJ-301 scintillators on electron energy

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    An experimental test of the electron energy scale linearities of SNO+ and EJ-301 scintillators was carried out using a Compton spectrometer with electrons in the energy range 0.09-3 MeV. The linearity of the apparatus was explicitly demonstrated. It was found that the response of both types of scintillators with respect to electrons becomes non-linear below ~0.4 MeV. An explanation is given in terms of Cherenkov light absorption and re-emission by the scintillators.Comment: 8 pages, 7 figure

    A microfluidic chip based model for the study of full thickness human intestinal tissue using dual flow

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    © 2016 Author(s). The study of inflammatory bowel disease, including Ulcerative Colitis and Crohn's Disease, has relied largely upon the use of animal or cell culture models; neither of which can represent all aspects of the human pathophysiology. Presented herein is a dual flow microfluidic device which holds full thickness human intestinal tissue in a known orientation. The luminal and serosal sides are independently perfused ex vivo with nutrients with simultaneous waste removal for up to 72 h. The microfluidic device maintains the viability and integrity of the tissue as demonstrated through Haematoxylin & Eosin staining, immunohistochemistry and release of lactate dehydrogenase. In addition, the inflammatory state remains in the tissue after perfusion on the device as determined by measuring calprotectin levels. It is anticipated that this human model will be extremely useful for studying the biology and tes ting novel interventions in diseased tissue

    Counter Machines and Distributed Automata: A Story about Exchanging Space and Time

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    We prove the equivalence of two classes of counter machines and one class of distributed automata. Our counter machines operate on finite words, which they read from left to right while incrementing or decrementing a fixed number of counters. The two classes differ in the extra features they offer: one allows to copy counter values, whereas the other allows to compute copyless sums of counters. Our distributed automata, on the other hand, operate on directed path graphs that represent words. All nodes of a path synchronously execute the same finite-state machine, whose state diagram must be acyclic except for self-loops, and each node receives as input the state of its direct predecessor. These devices form a subclass of linear-time one-way cellular automata.Comment: 15 pages (+ 13 pages of appendices), 5 figures; To appear in the proceedings of AUTOMATA 2018

    How to Beat the Boss: Game Workers Unite in the UK

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    This article provides an overview of the growth of game worker organising in Britain. These workers have not previously been organised in a trade union, but over the last 2 years, they have developed a campaign to unionise their sector and launched a legal trade union branch. This is a powerful example of so-called ‘greenfield’ organising, beyond the reach of existing trade unions and with workers who have not previously been members. The article provides an outline of the industry, the launch of the Game Workers Unite international network, the growth of the division in Britain as well as their formation as a branch of the Independent Workers’ Union of Great Britain. The aim is to draw out lessons for both the videogames industry, as well as other non-unionised industries, showing how the traditions of trade unionism can be translated and developed in new contexts
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