Browsing by Issue Date, starting with "2013-04-12"
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- European professional profile of the outreach worker in harm reductionPublication . Marques, Joana; Queiroz, José; Santos, Alina; Maia, SofiaThe book outlines the Professional Profile of the Outreach Worker in Harm Reduction, including the activities the OWHR should be able to develop, the skills and attitudes they should possess, as well as important categories of knowledge that should be included in the training curricula of these harm reduction workers. Along with the profile the reader will find several good practice examples from different harm reduction organisations across Europe that will hopefully give inspiration and support to those working in this field. The manual also presents an overview of the state of the OWHR profession at the moment in 11 European countries. This manual is targeting not only outreach workers as professionals, peers, students and volunteers, but also decision makers, politicians, trainers and other fundamental stakeholders, who are working or are interested in outreach work in harm reduction settings.
- Techniques for Measuring Aerosol Attenuation using the Central Laser Facility at the Pierre Auger ObservatoryPublication . Pierre Auger collaboration (505 authors); Abreu, Pedro; Andringa, Sofia; Assis, Pedro; Brogueira, Pedro; Cazon, Lorenzo; Conceição, Ruben; Diogo, Francisco; Espadanal, Joao; Gonçalves, Patrícia; Oliveira, Micael; Pimenta, Mário; Santo, Catarina E; Santos, Eva; Tomé, BernardoThe Pierre Auger Observatory in Malargüe, Argentina, is designed to study the properties of ultra-high energy cosmic rays with energies above 10(18)eV. It is a hybrid facility that employs a Fluorescence Detector to perform nearly calorimetric measurements of Extensive Air Shower energies. To obtain reliable calorimetric information from the FD, the atmospheric conditions at the observatory need to be continuously monitored during data acquisition. In particular, light attenuation due to aerosols is an important atmospheric correction. The aerosol concentration is highly variable, so that the aerosol attenuation needs to be evaluated hourly. We use light from the Central Laser Facility, located near the center of the observatory site, having an optical signature comparable to that of the highest energy showers detected by the FD. This paper presents two procedures developed to retrieve the aerosol attenuation of fluorescence light from CLF laser shots. Cross checks between the two methods demonstrate that results from both analyses are compatible, and that the uncertainties are well understood. The measurements of the aerosol attenuation provided by the two procedures are currently used at the Pierre Auger Observatory to reconstruct air shower data.
- Measurement of the top-antitop production cross section in the tau+jets channel in pp collisions at sqrt(s) = 7 TeVPublication . CMS collaboration (2200 authors); Hollar, Jonathan; Nayak, Aruna; Calpas, Betty; Almeida, Nuno; Bargassa, Pedrame; David Tinoco Mendes, Andre; Faccioli, Pietro; Ferreira Parracho, Pedro Guilherme; Gallinaro, Michele; Seixas, Joao; Varela, Joao; Vischia, Pietro; Lloret Iglesias, Lara; Musella, Pasquale; Rodrigues Antunes, Joao; Silva, Pedro; Pela, Joao; Leonardo, NunoThe top-quark pair production cross section in 7 TeV center-of-mass energy proton–proton collisions is measured using data collected by the CMS detector at the LHC. The measurement uses events with one jet identified as a hadronically decaying τ lepton and at least four additional energetic jets, at least one of which is identified as coming from a b quark. The analyzed data sample corresponds to an integrated luminosity of 3.9 fb(−1) recorded by a dedicated multijet plus hadronically decaying τ trigger. A neural network has been developed to separate the top-quark pairs from the W+jets and multijet backgrounds. The measured value of is consistent with the standard model predictions.