Meteorio : um estudo dos primeiros passos da detecção de meteoros por alunos brasileiros de ensino médio via aprendizagem significativa

A inserção da Física Moderna no programa de Ensino Médio é uma questão bastante presente na pesquisa atual em ensino de Física. Nessa perspectiva, o projeto MeteoRio apresenta-se como um caminho possível para a introdução, em nossas escolas, de temas de pesquisa de ponta em ciência. Ele tem por objetivo detectar meteoros e, futuramente, raios cósmicos em escolas brasileiras de Ensino Médio com a participação de alunos, professores e pesquisadores. O presente trabalho descreve o início da implementação do MeteoRio no Colégio de Aplicação da Universidade Federal do Rio de Janeiro e procura analisar as atividades desenvolvidas à luz da teoria da aprendizagem significativa de Ausubel. Pretendemos também verificar se aprender ciência fazendo ciência contribui para uma construção efetiva do conhecimento

Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at √s = 8 TeV

This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb −¹ of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy √s = 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50 % efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2–4 % for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques

Meteorio : um estudo dos primeiros passos da detecção de meteoros por alunos brasileiros de ensino médio via aprendizagem significativa

A inserção da Física Moderna no programa de Ensino Médio é uma questão bastante presente na pesquisa atual em ensino de Física. Nessa perspectiva, o projeto MeteoRio apresenta-se como um caminho possível para a introdução, em nossas escolas, de temas de pesquisa de ponta em ciência. Ele tem por objetivo detectar meteoros e, futuramente, raios cósmicos em escolas brasileiras de Ensino Médio com a participação de alunos, professores e pesquisadores. O presente trabalho descreve o início da implementação do MeteoRio no Colégio de Aplicação da Universidade Federal do Rio de Janeiro e procura analisar as atividades desenvolvidas à luz da teoria da aprendizagem significativa de Ausubel. Pretendemos também verificar se aprender ciência fazendo ciência contribui para uma construção efetiva do conhecimento

Retrospectiva sociolingüística: contribuições do PEUL Sociolinguistic overview: PEUL's contribution

<abstract language="eng">In this article we focus PEUL's (Programa de Estudos sobre o Uso da Língua) contribution to Brazilian Sociolinguistics, and, specifically, to variationist studies. We start by providing an overview of Rio de Janeiro variable phenomena. Then we show the spread of variation domain and emphasize the systematicity and regularity of a linguistic variable - the formal parallelism - on phenomena of language variation and change, and show some patterns of correlation between language and social structure

ATLAS

% ATLAS \\ \\ ATLAS is a general-purpose experiment for recording proton-proton collisions at LHC. The ATLAS collaboration consists of 144 participating institutions (June 1998) with more than 1750~physicists and engineers (700 from non-Member States). The detector design has been optimized to cover the largest possible range of LHC physics: searches for Higgs bosons and alternative schemes for the spontaneous symmetry-breaking mechanism; searches for supersymmetric particles, new gauge bosons, leptoquarks, and quark and lepton compositeness indicating extensions to the Standard Model and new physics beyond it; studies of the origin of CP violation via high-precision measurements of CP-violating B-decays; high-precision measurements of the third quark family such as the top-quark mass and decay properties, rare decays of B-hadrons, spectroscopy of rare B-hadrons, and $B ^0 _{s}$-mixing. \\ \\The ATLAS dectector, shown in the Figure includes an inner tracking detector inside a 2~T~solenoid providing an axial field, electromagnetic and hadronic calorimeters outside the solenoid and in the forward regions, and barrel and end-cap air-core-toroid muon spectrometers. The precision measurements for photons, electrons, muons and hadrons, and identification of photons, electrons, muons, $\tau$-leptons and b-quark jets are performed over $| \eta |$ < 2.5. The complete hadronic energy measurement extends over $| \eta |$ < 4.7. \\ \\The inner tracking detector consists of straw drift tubes interleaved with transition radiators for robust pattern recognition and electron identification, and several layers of semiconductor strip and pixel detectors providing high-precision space points. \\ \\The e.m. calorimeter is a lead-Liquid Argon sampling calorimeter with an integrated preshower detector and a presampler layer immediately behind the cryostat wall for energy recovery. The end-cap hadronic calorimeters also use Liquid Argon technology, with copper absorber plates. The end-cap cryostats house the e.m., hadronic and forward calorimeters (tungsten-Liquid Argon sampling). The barrel hadronic calorimeter is an iron-scintillating tile sampling calorimeter with longitudinal tile geometry. \\ \\Air-core toroids are used for the muon spectrometer. Eight superconducting coils with warm voussoirs are used in the barrel region complemented with superconducting end-cap toroids in the forward regions. The toroids will be instrumented with Monitored Drift Tubes (Cathode Strip Chambers at large rapidity where there are high radiation levels). The muon trigger and second coordinate measurement for muon tracks are provide

Search for high-mass resonances decaying to dilepton final states in pppp collisions at s=7\sqrt{s}= 7 TeV with the ATLAS detector

The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z' gauge bosons, Randall-Sundrum gravitons, Z* bosons, techni-mesons, Kaluza-Klein Z/gamma bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9/fb in the dielectron channel and 5.0/fb in the dimuon channel. A Z' boson with Standard Model-like couplings is excluded at 95 percent confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling k/Mbar = 0.1 is excluded at 95 percent confidence level for masses below 2.16 TeV. Limits on the other models are also presented, including Technicolor and Minimal Z' Models.Comment: 31 pages plus author list (53 pages total), 10 figures, 16 tables, submitted to Journal of High Energy Physics Revision corresponds to published versio