Avaliação da microestrutura e da microdureza do ferro fundido cinzento

Estudos sobre Ferro Fundido têm sido diversamente difundidos com o passar dos anos, devido a seu baixo custo e sua alta aplicação de mercado. Este trabalho tem como objetivo principal a caracterização microestrutural e a análise da Microdureza Vickers no ferro fundido cinzento que se diferenciam pela quantidade de Carbono existente na composição química 2,5 e 4,0% e de silício variam entre 1,0 e 3,0. As amostras foram preparadas metalograficamente, conforme norma ASTM E 407. As análises foram realizadas, utilizando-se os seguintes equipamentos: Microscópio Óptico (MO), Microscópio Eletrônico de Varredura (MEV) e Microdurômetro. Análises em MO mostram a morfologia das amostras, também utilizou-se o MEV para uma melhor visualização da morfologia da microestrutura. Testes de microdureza na escala Vickers foram realizados com duas cargas de indentação, 300 e 500 gf. A dureza por microindentação Vickers da amostra ficou em torno de 230 HV

Adiamento da gravidez: relação com fatores socioeconômicos e culturais / Postponing pregnancy: relationship with Socioeconomic and cultural factores

Introdução: A maternidade tardia é quando a concepção ocorre após os 35 anos de idade, sendo uma gestação de alto risco. As tecnologias artificiais estão cada vez mais presentes, o que permite gestações em mulheres fora da idade reprodutiva biológica usual. É necessário que haja uma conscientização das mulheres a respeito das complicações da gravidez tardia e que sejam acompanhadas e orientadas sobre os cuidados para que os índices de morbimortalidade materna possam diminuir. Objetivo: Verificar como os fatores socioeconômicos e culturais interferem na vida reprodutiva das mulheres. Métodos: Estudo observacional tipo transversal, na clínica Climar e no Departamento de Saúde da Mulher, da Gestante, da Criança e do Adolescente em Juiz de Fora - MG. Foram entrevistadas 195 pacientes ginecológicas. Foi aplicado um questionário contendo questões referentes a dados socioeconômicos, culturais e idade na primeira gestação.  Resultados: Das entrevistadas 56,9% eram da rede privada e 43,1% da pública. Na renda salarial foi observado que, 46,7% das mulheres da rede privada recebiam de 5-20 salários mínimos enquanto nenhuma das usuárias da rede pública recebiam esse valor. Já sobre os motivos que levaram ao adiamento da gravidez, 72,6% queriam uma carreira acadêmica e/ou conquistar o sucesso profissional antes da maternidade, sendo dessas 55% tinham idade maior ou igual a 35 anos. Conclusão: Há expressiva relação dos fatores socioeconômicos, culturais e educacionais com o adiamento da maternidade. Quanto maior o nível de escolaridade e renda salarial, maior a chance de ocorrer o adiamento da gestação, sendo necessário, a conscientização dos riscos dessa escolha e a importância de um pré-natal orientado e de cuidados contínuos

Paciente pediátrico portador de transtorno espectro autista em um ambulatório: relato de experiência / Pediatric patient with autistic spectrum disorder in an outpatient clinic: experience report

O transtorno do espectro autista (TEA) é um grupo de distúrbios do desenvolvimento neurológico de início precoce, caracterizado por comprometimento das habilidades sociais e de comunicação, além de comportamentos estereotipados. Este trabalho teve como objetivo relatar a experiência vivenciadas durante o período das aulas práticas em um ambulatório pediátrico, pontuando a assistência de enfermagem para um paciente pediátrico com Transtorno do Espectro Autista (TEA), e os cuidados voltados para as suas enfermidades. Trata-se de um estudo descritivo do tipo relato de experiência, realizado por acadêmicas de enfermagem da Universidade da Amazônia - UNAMA, durante as aulas práticas em um ambulatório infantil em Belém – PA, concluímos que a importância do enfermeiro sobre orientar os pais, e direciona-los a consultar o filho com outros profissionais da equipe multiprofissional de saúde, e para melhorar a qualidade de vida da criança.

Measurement of the cross-section and charge asymmetry of WW bosons produced in proton-proton collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13

Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at √ s = 8 TeV with the ATLAS detector

Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses 20.3 fb−1 of √ s = 8 TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with pT > 120 GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between Emiss T > 150 GeV and Emiss T > 700 GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presente

Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in √s=13 TeV pp collisions with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of √s=13  TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV

Search for High-Mass Resonances Decaying to τν in pp Collisions at √s=13 TeV with the ATLAS Detector

A search for high-mass resonances decaying to τν using proton-proton collisions at √s=13 TeV produced by the Large Hadron Collider is presented. Only τ-lepton decays with hadrons in the final state are considered. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb−1. No statistically significant excess above the standard model expectation is observed; model-independent upper limits are set on the visible τν production cross section. Heavy W′ bosons with masses less than 3.7 TeV in the sequential standard model and masses less than 2.2–3.8 TeV depending on the coupling in the nonuniversal G(221) model are excluded at the 95% credibility level

Combined measurement of differential and total cross sections in the H → γγ and the H → ZZ* → 4ℓ decay channels at s=13 TeV with the ATLAS detector

A combined measurement of differential and inclusive total cross sections of Higgs boson production is performed using 36.1 fb−1 of 13 TeV proton–proton collision data produced by the LHC and recorded by the ATLAS detector in 2015 and 2016. Cross sections are obtained from measured H→γγ and H→ZZ*(→4ℓ event yields, which are combined taking into account detector efficiencies, resolution, acceptances and branching fractions. The total Higgs boson production cross section is measured to be 57.0−5.9 +6.0 (stat.) −3.3 +4.0 (syst.) pb, in agreement with the Standard Model prediction. Differential cross-section measurements are presented for the Higgs boson transverse momentum distribution, Higgs boson rapidity, number of jets produced together with the Higgs boson, and the transverse momentum of the leading jet. The results from the two decay channels are found to be compatible, and their combination agrees with the Standard Model predictions

Measurement of jet fragmentation in Pb+Pb and pp collisions at √s NN =5.02 TeV with the ATLAS detector

This paper presents a measurement of jet fragmentation functions in 0.49 nb −1 of Pb+Pb collisions and 25 pb −1 of pp collisions at √ sNN =5.02 TeV collected in 2015 with the ATLAS detector at the LHC. These measurements provide insight into the jet quenching process in the quark-gluon plasma created in the aftermath of ultra-relativistic collisions between two nuclei. The modifications to the jet fragmentation functions are quantified by dividing the measurements in Pb+Pb collisions by baseline measurements in pp collisions. This ratio is studied as a function of the transverse momentum of the jet, the jet rapidity, and the centrality of the collision. In both collision systems, the jet fragmentation functions are measured for jets with transverse momentum between 126 GeV and 398 GeV and with an absolute value of jet rapidity less than 2.1. An enhancement of particles carrying a small fraction of the jet momentum is observed, which increases with centrality and with increasing jet transverse momentum. Yields of particles carrying a very large fraction of the jet momentum are also observed to be enhanced. Between these two enhancements of the fragmentation functions a suppression of particles carrying an intermediate fraction of the jet momentum is observed in Pb+Pb collisions. A small dependence of the modifications on jet rapidity is observed

Search for Higgs bosons produced via vector-boson fusion and decaying into bottom quark pairs in √s =13 TeV pp collisions with the ATLAS detector

A search for the bb ¯ decay of the Standard Model Higgs boson produced through vector-boson fusion is presented. Three mutually exclusive channels are considered: two all-hadronic channels and a photon-associated channel. Results are reported from the analysis of up to 30.6 fb −1 of pp data at s √ =13 TeV collected with the ATLAS detector at the LHC. The measured signal strength relative to the Standard Model prediction from the combined analysis is 2.5 +1.4 −1.3 for inclusive Higgs boson production and 3.0 +1.7 −1.6 for vector-boson fusion production only