750 research outputs found

    Analysis Of the Performance of Numerical Methods of Inversion of the Laplace Transform

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    Em geral, o cálculo da transformada de Laplace inversa diretamente da definição, dada pela integral de Bromwich, é muito difícil. Como alternativa são utilizados métodos numéricos de inversão. Neste artigo, estudamos a precisão e o tempo de máquina dos métodos de Talbot Fixo, Dubner-Abate, Durbin, Gaver-Stehfest e Euler. Especificamente, realizamos diversos experimentos computacionais a partir da implementação própria destes métodos. Ainda, o desempenho é avaliado para funções teste que ocorrem usualmente como parte das soluções de equações diferenciais ordinárias. Os resultados da experimentação computacional permitem concluir que o método de Talbot Fixo apresenta o melhor desempenho.In general, the calculation of the inverse Laplace transform directly from the definition, given by the Bromwich integral, is very difficult. As an alternative, numerical inversion methods are used. In this article, we study the precision and machine time of the Fixed Talbot, Dubner- Abate, Durbin, Gaver-Stehfest and Euler methods. Specifically, we performed several computational experiments based on our own implementation of these methods. Furthermore, performance is evaluated for test functions that usually occur as part of solutions to ordinary differential equations. The results of the computational experimentation allow us to conclude that the Fixed Talbot method presents the best performance

    Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data

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    Search for heavy gauge W ' bosons in events with an energetic lepton and large missing transverse momentum at root s=13TeV

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    Multiplicity and rapidity dependence of strange hadron production in pp, pPb, and PbPb collisions at the LHC

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    Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV

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    Observation of the diphoton decay of the Higgs boson and measurement of its properties

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    Search for massive resonances decaying in to WW,WZ or ZZ bosons in proton-proton collisions at root s=13 TeV

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    Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at √s=8 TeV

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    Association of genomic domains in BRCA1 and BRCA2 with prostate cancer risk and aggressiveness

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    Pathogenic sequence variants (PSV) in BRCA1 or BRCA2 (BRCA1/2) are associated with increased risk and severity of prostate cancer. Weevaluated whether PSVs inBRCA1/2 were associated with risk of overall prostate cancer or high grade (Gleason 8+) prostate cancer using an international sample of 65 BRCA1 and 171 BRCA2 male PSV carriers with prostate cancer, and 3,388 BRCA1 and 2,880 BRCA2 male PSV carriers without prostate cancer. PSVs in the 30 region of BRCA2 (c.7914+) were significantly associated with elevated risk of prostate cancer compared with reference bin c.1001c.7913 [HR = 1.78; 95% confidence interval (CI), 1.25-2.52; P = 0.001], as well as elevated risk of Gleason 8+ prostate cancer (HR = 3.11; 95% CI, 1.63-5.95; P = 0.001). c.756-c.1000 was also associated with elevated prostate cancer risk (HR = 2.83; 95% CI, 1.71-4.68; P = 0.00004) and elevated risk of Gleason 8+prostate cancer (HR = 4.95; 95% CI, 2.12-11.54; P = 0.0002). No genotype-phenotype associations were detected for PSVs in BRCA1. These results demonstrate that specific BRCA2 PSVs may be associated with elevated risk of developing aggressive prostate cancer. Significance: Aggressive prostate cancer risk in BRCA2 mutation carriers may vary according to the specific BRCA2 mutation inherited by the at-risk individual.Peer reviewe

    Search for supersymmetry in events with photons and missing transverse energy in pp collisions at 13 TeV

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