6,422 research outputs found

    Study of Resistive Micromegas in a Mixed Neutron and Photon Radiation Field

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    The Muon ATLAS Micromegas Activity (MAMMA) focuses on the development and testing of large-area muon detectors based on the bulk-Micromegas technology. These detectors are candidates for the upgrade of the ATLAS Muon System in view of the luminosity upgrade of Large Hadron Collider at CERN (sLHC). They will combine trigger and precision measurement capability in a single device. A novel protection scheme using resistive strips above the readout electrode has been developed. The response and sparking properties of resistive Micromegas detectors were successfully tested in a mixed (neutron and gamma) high radiation field supplied by the Tandem accelerator, at the N.C.S.R. Demokritos in Athens. Monte-Carlo studies have been employed to study the effect of 5.5 MeV neutrons impinging on Micromegas detectors. The response of the Micromegas detectors on the photons originating from the inevitable neutron inelastic scattering on the surrounding materials of the experimental facility was also studied

    Evidence for hadronic deconfinement in pˉ\bar{p}-p collisions at 1.8 TeV

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    We have measured deconfined hadronic volumes, 4.4<V<13.04.4 < V < 13.0 fm3^{3}, produced by a one dimensional (1D) expansion. These volumes are directly proportional to the charged particle pseudorapidity densities 6.75<dNc/dη<20.26.75 < dN_{c}/d\eta < 20.2. The hadronization temperature is T=179.5±5T = 179.5 \pm 5 (syst) MeV. Using Bjorken's 1D model,the hadronization energy density is ϵF=1.10±0.26\epsilon_{F} = 1.10 \pm 0.26 (stat) GeV/fm3^{3} corresponding to an excitation of 24.8±6.224.8 \pm 6.2 (stat) quark-gluon degrees of freedom.Comment: 15 pages, 3 figures, 2 table

    Identification of circles from datapoints using Gaussian sums

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    We present a pattern recognition method which use datapoints on a plane and estimates the parameters of a circle. MC data are generated in order to test the method's efficiency over noise hits, uncertainty in the hits positions and number of datapoints. The scenario were the hits from a quadrant of the circle are missing is also considered. The method proposed is proven to be robust, accurate and very efficient.Comment: 4 pages, 5 figure

    Co-creating sustainable food futures with botanical gardens and communities: reflections from the BigPicnic project

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    This article addresses the potential of participatory approaches and processes of co-creation in the context of botanical gardens. It examines how such approaches can not only help cultural heritage sector organisations to engage with different members of their public, but also how they can work with their communities to tackle globally significant societal and environmental goals. Drawing on research conducted for the EU-funded BigPicnic project, this article examines the methodological processes employed by a large consortium of botanical gardens and presents some examples of exhibitions and science cafés that attempted to both highlight issues of food security and sustainability and foster forms of knowledge that go beyond the dichotomy between experts and non-experts. A critical overview of the outcomes of this project serves to outline the potential of co-creation for promoting sustainable food futures

    On signals of new physics in global event properties in pp collisions in the TeV energy domain

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    In the framework of the weighted superposition mechanism of different classes of minimum bias events (or substructures), described by the negative binomial multiplicity distribution, in possible scenarios for pp collisions in the TeV energy domain, we explore global properties of an eventual new class of events, characterised by high hadron and clan densities, to be added to the soft (without minijets) and semihard (with minijets) ones. It turns out that the main signal of the mentioned new physical expectations at 14 TeV c.m. energy would be an ``elbow structure'' in the tail of the total charged particle multiplicity distribution in complete disagreement with the second shoulder structure predicted by Pythia Monte Carlo calculations: a challenging problem for new experimental work.Comment: 14 pages, 6 ps figures include

    The social ecology of food: where agroecology and heritage meet

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    The current food system is unsustainable and no longer able to cope with the challenges caused by climate change and consumer behaviours. In this context, agroecology, with its commitment to crossing disciplinary boundaries, has been endorsed as one of the main approaches to the creation of a sustainable food system. Despite this, the integration of the social research on food has not been evident enough in agroecology as a discipline. To be sure, studies related to foodways, food traditions, and, more recently, food heritage have long been present, and have provided important insights into the social and cultural aspects of food. However, there appears to be little convergence between this body of research and the mainstream agroecology literature. This paper aims to address this disconnection between the sociocultural and environmental aspects of the food system, and to propose ways of moving forward. We argue that knowledge about food heritage can be a catalyst for the achievement of agroecology’s vision for whole-system transformative change, and a moving towards global food security and nutrition. Using the agroecology framework of the United Nation’s Food and Agriculture Organization (FAO) and looking at the examples of the subak system in Indonesia and the EU-funded BigPicnic project, we employ the elements of ‘co-creation and sharing of knowledge’, ‘culture and food traditions’ and ‘human and social values’ as entry points for the creation of sustainable transitions of the food and agricultural systems