Percorrer por autor "Silva, J."
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- Angular distributions in t(t)over-barH(H -> b(b)over-bar) reconstructed events at the LHCPublication . Santos, S. P. Amor dos; Araque, J. P.; Cantrill, R.; Castro, N. F.; Fiolhais, M. C. N.; Frederix, R.; Gonçalo, R.; Martins, R.; Santos, R.; Silva, J.; Onofre, A.; Peixoto, H.; Reigoto, A.The associated production of a Higgs boson and a top-quark pair, t (t) over barH, in proton-proton collisions is addressed in this paper for a center of mass energy of 13 TeV at the LHC. Dileptonic final states of t (t) over barH events with two oppositely charged leptons and four jets from the decays t -> bW(+) -> bl(+)v(l), (t) over bar -> (b) over barW(-) -> (b) over barl(-)(v) over bar (l) and h -> b (b) over bar are used. Signal events, generated with MadGraph5_aMC@NLO, are fully reconstructed by applying a kinematic fit. New angular distributions of the decay products as well as angular asymmetries are explored in order to improve discrimination of t (t) over barH signal events over the dominant irreducible background contribution, t (t) over barb (b) over bar. Even after the full kinematic fit reconstruction of the events, the proposed angular distributions and asymmetries are still quite different in the t (t) over barH signal and the dominant background (t (t) over barb (b) over bar).
- Chemotherapy-associated cardiotoxicity in women with breast cancer: assessment of left atrial strain by transthoracic echocardiographyPublication . Sousa, R. M.; Fonseca, Virgínia; Henriques, M.; Cavaco, S.; Silva, J.; Clérigo, Anália MatosBackground: Transthoracic echocardiography (TTE) is considered the gold-standard method for assessing cardiac function, with left ventricular ejection fraction (LVEF) and global longitudinal strain (GLS) being the main parameters used for early detection of cardiotoxicity. Left atrial (LA) strain represents the myocardial deformation of this structure and is assessed based on three main parameters, among which peak atrial longitudinal strain (PALS) stands out for best reflecting global LA function. Purpose: To evaluate left atrial strain by TTE as a predictor of cardiotoxicity at different stages of treatment with anthracyclines and trastuzumab in women with breast cancer.
- Model predictive control of dual three-phase four-leg multilevel inverter supplying photovoltaic energy to low-voltage unbalanced gridsPublication . Monteiro, Joaquim; Pires, V. Fernão; Silva, J.; Fernando et al.; Monteiro, JoaquimIn this paper, a new control system is proposed for a grid-connected photovoltaic (PV) generation system based on a dual three-phase four leg multilevel inverter. This power converter topology, built using two four-leg two-level three-phase inverters, connects two PV arrays in the DC side to three open-end-windings of a three-phase transformer on the AC side. This arrangement is controlled to inject the PV generated power into the low voltage (LV) grid allowing support for unbalanced loads. The proposed control system is based in the model predictive control (MPC). It allows the control of the injected grid currents in balanced/unbalanced conditions while ensuring the balance of the capacitor DC voltages. Several simulation tests are made to validate the effectiveness of the control strategy applied to the proposed PV generation system.
- Neoplasia maligna com características de adenocarcinoma extrauterino: estudo de caso clínicoPublication . Babo, A.; Silva, J.; Roque, RubenAs neoplasias malignas identificadas em citologia cervicovaginal com características de adenocarcinomas extrauterinos são neoplasias raras e agressivas, frequentemente diagnosticadas em estadios avançados, devido à sua apresentação clínica pouco específica. Este tipo de carcinoma representa um desafio significativo para o diagnóstico, exigindo uma abordagem interdisciplinar. Neste estudo, apresentamos um caso clínico de uma mulher de 75 anos com extensa carcinomatose peritoneal de predomínio infraumbilical. A citologia cervicovaginal em meio líquido revelou uma neoplasia maligna compatível com adenocarcinoma extrauterino, mas a origem exata não pode ser determinada com certeza. O exame histológico do tumor revelou tratar-se de um carcinoma misto com componente de carcinoma seroso de alto grau e um componente de carcinoma de células claras, não fazendo distinção entre ovário/trompa de Falópio/peritoneu ou origem endometrial. Este caso salienta a capacidade de deteção da citologia em neoplasias extrauterinas, enfatizando a importância crítica da integração de técnicas complementares para a caracterização e diagnóstico definitivo destes carcinomas.
- Probing the CP nature of the Higgs coupling in tth events at the LHCPublication . dos Santos, S. Amor; Fiolhais, M. C. N.; Frederix, R.; Goncalo, R.; Gouveia, E.; Martins, R.; Onofre, A.; Pease, C. M.; Peixoto, H.; Reigoto, A.; dos Santos, Rui Alberto; Silva, J.The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tt _ h events produced in pffisffiffi 13 TeV proton- proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays t. bW_. bl_.l, _ t. _ bW-. _ bl- _.l, and h. b _ b. Pure scalar ( h H), pure pseudoscalar ( h A), and CP- violating Higgs boson signal events, generated with MADGRAPH5_ AMC@ NLO, are fully reconstructed through a kinematic fit. We furthermore generate samples that have both a CP- even and a CP- odd component in the t _ th coupling in order to probe the ratio of the two components. New angular distributions of the decay products, as well as CP angular asymmetries, are explored in order to separate the scalar from the pseudoscalar components of the Higgs boson and reduce the contribution from the dominant irreducible background, t _ tb _ b. Significant differences between the angular distributions and asymmetries are observed, even after the full kinematic fit reconstruction of the events, allowing to define the best observables for a global fit of the Higgs couplings parameters.