Ceramic piece productinon through the slip casting technique using clay from the Jacobina-Bahia area

The identity of Bahia is based on pillars that are reinforced every year. As main goal, this work approaches an ancient technique of producing ceramic pieces using the clay found in the region of Jacobina-BA by casting slip – a widely used technique and of low cost. To use the minerals collected, a characterization of the materials was carried out, using techniques as X-Ray Diffraction, X-Ray Fluorescence and Thermal Analysis. Although it is a simple process, it is necessary to monitor and study it in order to obtain the required knowledge to execute the project, always regarding the ecology and the promotion of arts and decoration, the real purpose of those techniques.A identidade da Bahia está baseada em pilares que são reforçados a cada ano. Como principal objetivo, o presente trabalho aborda uma antiga técnica para criação de peças cerâmicas utilizando argilas oriundas da região de Jacobina-BA por meio da colagem de barbotina - técnica amplamente difundida e de baixo custo. Para a utilização dos minerais dali retirados fez-se necessária uma caracterização dos materiais empregados, feita por meio de técnicas como Difração de Raio-X, Fluorescência de Raio-X e Análises Térmicas. Embora trate-se de um processo simples faz-se necessário o acompanhamento e estudo para a obtenção dos conhecimentos mínimos para a execução do projeto, tendo em vista sempre a questão ecológica e o fomento à área de artes e decoração, a que se destina as técnicas de fato.São Cristóvão, S

Análise comparativa das abordagens cirúrgicas no tratamento de cardiopatias

Em análise a evolução histórica e as inovações na cirurgia cardíaca, este estudo objetiva analisar comparativamente as abordagens cirúrgicas no tratamento de cardiopatias, destacando a transição das técnicas tradicionais de cirurgia aberta para métodos minimamente invasivos como a videolaparoscopia e a cirurgia robótica. Para tanto, procede-se à uma revisão narrativa da literatura, explorando uma gama extensiva de estudos e relatos científicos que ilustram os avanços tecnológicos e seus impactos nos resultados clínicos. Desse modo, observa-se que as técnicas minimamente invasivas oferecem benefícios substanciais, como redução no tempo de recuperação, diminuição do trauma cirúrgico, e menores taxas de complicações e mortalidade perioperatória em comparação com a cirurgia aberta. Estes resultados permitem concluir que a cirurgia minimamente invasiva representa um avanço significativo na prática cardiológica, proporcionando procedimentos mais seguros e eficazes, com menor impacto para os pacientes e melhores prognósticos a longo prazo. Para futuras pesquisas, sugere-se o aprofundamento na análise dos resultados a longo prazo e na integração de novas tecnologias, como inteligência artificial e realidade aumentada, para otimizar ainda mais as práticas cirúrgicas e expandir as possibilidades de tratamento das cardiopatias

Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks

A search is presented for narrow heavy resonances X decaying into pairs of Higgs bosons (H) in proton-proton collisions collected by the CMS experiment at the LHC at root s = 8 TeV. The data correspond to an integrated luminosity of 19.7 fb(-1). The search considers HH resonances with masses between 1 and 3 TeV, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and t (t) over bar events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95 confidence level for the product of the production cross section and branching fraction sigma(gg -> X) B(X -> HH -> b (b) over barb (b) over bar) range from 10 to 1.5 fb for the mass of X from 1.15 to 2.0 TeV, significantly extending previous searches. For a warped extra dimension theory with amass scale Lambda(R) = 1 TeV, the data exclude radion scalar masses between 1.15 and 1.55 TeV

Search for supersymmetry in events with one lepton and multiple jets in proton-proton collisions at root s=13 TeV

Peer reviewe

Measurement of the top quark mass using charged particles in pp collisions at root s=8 TeV

Peer reviewe

Search for long-lived particles decaying to jets with displaced vertices in proton-proton collisions at root s=13 Te V

A search is presented for long-lived particles produced in pairs in proton-proton collisions at the LHC operating at a center-of-mass energy of 13 TeV. The data were collected with the CMS detector during the period from 2015 through 2018, and correspond to a total integrated luminosity of 140 fb(-1). This search targets pairs of long-lived particles with mean proper decay lengths between 0.1 and 100 mm, each of which decays into at least two quarks that hadronize to jets, resulting in a final state with two displaced vertices. No significant excess of events with two displaced vertices is observed. In the context of R-parity violating supersymmetry models, the pair production of long-lived neutralinos, gluinos, and top squarks is excluded at 95% confidence level for cross sections larger than 0.08 fb, masses between 800 and 3000 GeV, and mean proper decay lengths between 1 and 25 mm.Peer reviewe

Performance of the CMS muon trigger system in proton-proton collisions at √s = 13 TeV

The muon trigger system of the CMS experiment uses a combination of hardware and software to identify events containing a muon. During Run 2 (covering 2015-2018) the LHC achieved instantaneous luminosities as high as 2 × 10 cm s while delivering proton-proton collisions at √s = 13 TeV. The challenge for the trigger system of the CMS experiment is to reduce the registered event rate from about 40 MHz to about 1 kHz. Significant improvements important for the success of the CMS physics program have been made to the muon trigger system via improved muon reconstruction and identification algorithms since the end of Run 1 and throughout the Run 2 data-taking period. The new algorithms maintain the acceptance of the muon triggers at the same or even lower rate throughout the data-taking period despite the increasing number of additional proton-proton interactions in each LHC bunch crossing. In this paper, the algorithms used in 2015 and 2016 and their improvements throughout 2017 and 2018 are described. Measurements of the CMS muon trigger performance for this data-taking period are presented, including efficiencies, transverse momentum resolution, trigger rates, and the purity of the selected muon sample. This paper focuses on the single- and double-muon triggers with the lowest sustainable transverse momentum thresholds used by CMS. The efficiency is measured in a transverse momentum range from 8 to several hundred GeV

Measurement of the azimuthal anisotropy of Y(1S) and Y(2S) mesons in PbPb collisions at root s(NN)=5.02 TeV

The second-order Fourier coefficients (v(2)) characterizing the azimuthal distributions of Y(1S) and Y(2S) mesons produced in PbPb collisions at root s(NN) = 5.02 TeV are studied. The Y mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of 1.7 nb(-1). The scalar product method is used to extract the v2 coefficients of the azimuthal distributions. Results are reported for the rapidity range vertical bar y vertical bar < 2.4, in the transverse momentum interval 0 < pT < 50 GeV/c, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/psi mesons, the measured v(2) values for the Y mesons are found to be consistent with zero. (C) 2021 The Author(s). Published by Elsevier B.V.Peer reviewe

Search for a heavy resonance decaying to a top quark and a w boson at √s = 13 tev in the fully hadronic final state

A search for a heavy resonance decaying to a top quark and a W boson in the fully hadronic final state is presented. The analysis is performed using data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1 recorded by the CMS experiment at the LHC. The search is focused on heavy resonances, where the decay products of each top quark or W boson are expected to be reconstructed as a single, large-radius jet with a distinct substructure. The production of an excited bottom quark, b*, is used as a benchmark when setting limits on the cross section for a heavy resonance decaying to a top quark and a W boson. The hypotheses of b* quarks with left-handed, right-handed, and vector-like chiralities are excluded at 95% confidence level for masses below 2.6, 2.8, and 3.1 TeV, respectively. These are the most stringent limits on the b* quark mass to date, extending the previous best limits by almost a factor of two