78 research outputs found

    E-Scooter as Environmentally Friendly Last Mile Option? Insights on Spatial and Infrastructural Implications for Urban Areas based on the Example of Vienna

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    We recently face an e-scooter hype in Europe. More and more e-scooter sharing offers are provided in cities and towns which are marketed as a last mile option. At the same time, a greater extent of private households has their own equipment. This trend is two-fold as e-scooter offers not only provide benefits (e.g. in terms of accessibility) but also pose certain risks (e.g. in terms of road safety). To find out about spatial and technical implications and to assess the potential of e-scooters for urban areas, we used a ‘triangulation’ research strategy using different sources. Based on the insights from a trend and target group analysis and focus groups with users and non-users we conducted 1-week tests with personsusing e-scooters on everyday routes (N=51), a survey of users and non-users (N=128) and course exercises carried out with pupils (N=94) in the city of Vienna in Austria. Against widespread assumptions that e-scooters can use existing infrastructure, we found that the preconditions are not necessarily suitable for e-scooters. Infrastructure elements would have to be adapted to enable a safe use of e-scooters. It was revealed that e-scooter usage should be recommended for the last mile in suburban areas and not the city center as the density and infrastructure (e.g. cubblestone) do not correspond to preconditions essential for a safe e-scooter usage. In addition to that, we found that labeling e-scooters as an environmentally friendly option is the subject of controversial debate

    Study of ordered hadron chains with the ATLAS detector

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    La lista completa de autores que integran el documento puede consultarse en el archivo

    A search for resonances decaying into a Higgs boson and a new particle X in the XH→qqbb final state with the ATLAS detector

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    A search for heavy resonances decaying into a Higgs boson (HH) and a new particle (XX) is reported, utilizing 36.1 fb1^{-1} of proton-proton collision data at s=\sqrt{s} = 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle XX is assumed to decay to a pair of light quarks, and the fully hadronic final state XHqqˉbbˉXH \rightarrow q\bar q'b\bar b is analysed. The search considers the regime of high XHXH resonance masses, where the XX and HH bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XHXH mass versus XX mass is scanned for evidence of a signal, over a range of XHXH resonance mass values between 1 TeV and 4 TeV, and for XX particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XHXH and XX masses, on the production cross-section of the XHqqˉbbˉXH\rightarrow q\bar q'b\bar b resonance

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Study of the material of the ATLAS inner detector for Run 2 of the LHC

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    Instituto de Física La Plat

    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Measurement of the W boson polarisation in ttˉt\bar{t} events from pp collisions at s\sqrt{s} = 8 TeV in the lepton + jets channel with ATLAS

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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