Browsing by Issue Date, starting with "2018-05-10"
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- Vitamin content in food supplements: are we getting what we need?Publication . Costa, Isabel Margarida; Figueiredo, Alexandra; Moutinho, Guilhermina Martins; Auxtero, Maria Deolinda
- Minerals content in food supplements: label doses surveyPublication . Simões, Joana; Costa, Isabel Margarida; Figueiredo, Alexandra; Moutinho, Guilhermina Martins; Auxtero, Maria Deolinda
- Medidas de eficiência energética no setor industrialPublication . Amado, Luís Filipe Quintas; Tavares, Paulo Filipe de Almeida Ferreira; Marto, Helena Jorge Carvalho da SilvaO presente trabalho tem como motivação base o estudo de Medidas de Eficiência Energética no Setor Industrial. O elevado consumo de energia neste setor leva as empresas a procurarem soluções que permitam aumentar a eficiência energética nas suas instalações e nos processos produtivos, promovendo a redução do consumo energético e reduzindo os custos. Neste contexto, surgiram os objetivos deste trabalho, que resultaram das principais necessidades identificadas pela empresa à data da realização do mesmo. O trabalho consistiu na implementação de soluções que visem a eficiência energéticas na substituição da iluminação existente, na substituição dos motores elétricos nas máquinas de injeção, na instalação de um sistema solar fotovoltaico para autoconsumo e no projeto de um posto de transformação. Os estudos de eficiência energética realizados têm como base uma cuidada análise dos dados recolhidos junto da empresa, todas as medições registadas, os perfis de consumo traçados, uma extensa pesquisa de mercado, com o intuito de encontrar as soluções eficientes mais adequadas para cada caso e metodologias de cálculo já existentes e devidamente comprovadas, conduzindo, desta forma, a uma maior fiabilidade dos resultados obtidos. Estes estudos evidenciaram até que ponto a implementação das diversas medidas apresentadas são economicamente viáveis, o seu impacto na redução do consumo energético e a poupança anual obtida.
- A prática regular de exercício físico em mulheres na menopausa:Publication . Coelho, Zélia; Figueiras, Maria JoãoO sedentarismo é uma condição preocupante nos nossos dias, apesar de ser conhecida a relação positiva entre a atividade física e a saúde física e mental. Nos últimos anos, a prática regular do exercício físico tem sido reconhecida como uma alternativa não medicamentosa para a promoção da saúde, qualidade de vida e a obtenção da sensação de bem-estar. o envolvimento do indivíduo com esta prática está associado a maiores níveis de satisfação com a vida e felicidade. Estudos revelam que a prática de exercício físico regular tem influência nos estados de humor, na ansiedade e na qualidade de vida. No presente estudo foi estudada a sua relação com a menopausa. Investigações evidenciam que os sintomas psicológicos que podem ocorrer durante a menopausa melhoram com a prática regular de exercício físico. A amostra do presente estudo foi constituída por 120 mulheres, que se encontram na menopausa, praticantes e não praticantes de exercício físico regular. A análise dos dados foi realizada através do SPSS 24. Os resultados indicam que as mulheres que praticam exercício físico regular apresentam melhores estados de humor e menos ansiedade do que as que não praticam. Concluímos também que a prática regular de exercício físico parece estar associada a uma melhor qualidade de vida.
- Search for supersymmetry in events with one lepton and multiple jets exploiting the angular correlation between the lepton and the missing transverse momentum in proton-proton collisions at $\sqrt{s} = $ 13 TeVPublication . CMS collaboration (2240 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Calpas, Betty; Di Francesco, Agostino; Faccioli, Pietro; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeResults are presented from a search for supersymmetry in events with a single electron or muon and hadronic jets. The data correspond to a sample of proton-proton collisions at $\sqrt{s} = $ 13 TeV with an integrated luminosity of 35.9 fb$^{-1}$, recorded in 2016 by the CMS experiment. A number of exclusive search regions are defined according to the number of jets, the number of b-tagged jets, the scalar sum of the transverse momenta of the jets, and the scalar sum of the missing transverse momentum and the transverse momentum of the lepton. Standard model background events are reduced significantly by requiring a large azimuthal angle between the direction of the lepton and of the reconstructed W boson, computed under the hypothesis that all of the missing transverse momentum in the event arises from a neutrino produced in the leptonic decay of the W boson. The numbers of observed events are consistent with the expectations from standard model processes, and the results are used to set lower limits on supersymmetric particle masses in the context of two simplified models of gluino pair production. In the first model, where each gluino decays to a top quark-antiquark pair and a neutralino, gluino masses up to 1.8 TeV are excluded at the 95% CL. The second model considers a three-body decay to a light quark-antiquark pair and a chargino, which subsequently decays to a W boson and a neutralino. In this model, gluinos are excluded up to 1.9 TeV.
- Measurement of the cross section for isolated-photon plus jet production in $pp$ collisions at $\sqrt s=13$ TeV using the ATLAS detectorPublication . ATLAS collaboration (2904 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Oleiro Seabra, Luis Filipe; Onofre, António; Pedro, Rute; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutThe dynamics of isolated-photon production in association with a jet in proton–proton collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 fb −1 . Photons are required to have transverse energies above 125 GeV. Jets are identified using the anti- kt algorithm with radius parameter R=0.4 and required to have transverse momenta above 100 GeV. Measurements of isolated-photon plus jet cross sections are presented as functions of the leading-photon transverse energy, the leading-jet transverse momentum, the azimuthal angular separation between the photon and the jet, the photon–jet invariant mass and the scattering angle in the photon–jet centre-of-mass system. Tree-level plus parton-shower predictions from Sherpa and Pythia as well as next-to-leading-order QCD predictions from Jetphox and Sherpa are compared to the measurements.
- Search for gauge-mediated supersymmetry in events with at least one photon and missing transverse momentum in pp collisions at $\sqrt{s} = $ 13 TeVPublication . CMS collaboration (2262 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Di Francesco, Agostino; Faccioli, Pietro; Galinhas, Bruno; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Strong, Giles; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeA search for gauge-mediated supersymmetry (SUSY) in final states with photons and large missing transverse momentum is presented. The data sample of pp collisions at s=13TeV was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 35.9 fb −1 . Data are compared with models in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape detection. The event selection is optimized for both electroweak (EWK) and strong production SUSY scenarios. The observed data are consistent with standard model predictions, and limits are set in the context of a general gauge mediation model in which gaugino masses up to 980 GeV are excluded at 95% confidence level. Gaugino masses below 780 and 950 GeV are excluded in two simplified models with EWK production of mass-degenerate charginos and neutralinos. Stringent limits are set on simplified models based on gluino and squark pair production, excluding gluino (squark) masses up to 2100 (1750) GeV depending on the assumptions made for the decay modes and intermediate particle masses. This analysis sets the highest mass limits to date in the studied EWK models, and in the considered strong production models when the mass difference between the gauginos and the squarks or gluinos is small.
- Search for new long-lived particles at $\sqrt{s} =$ 13 TeVPublication . CMS collaboration (2238 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Calpas, Betty; Di Francesco, Agostino; Faccioli, Pietro; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeA search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb −1 collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.
- Evidence for the Higgs boson decay to a bottom quark–antiquark pairPublication . CMS collaboration (2257 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Di Francesco, Agostino; Faccioli, Pietro; Galinhas, Bruno; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Strong, Giles; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeA search for the standard model (SM) Higgs boson (H) decaying to bb‾ when produced in association with an electroweak vector boson is reported for the following processes: Z(νν)H , W(μν)H , W(eν)H , Z(μμ)H , and Z(ee)H . The search is performed in data samples corresponding to an integrated luminosity of 35.9 fb−1 at s=13TeV recorded by the CMS experiment at the LHC during Run 2 in 2016. An excess of events is observed in data compared to the expectation in the absence of a H→bb‾ signal. The significance of this excess is 3.3 standard deviations, where the expectation from SM Higgs boson production is 2.8. The signal strength corresponding to this excess, relative to that of the SM Higgs boson production, is 1.2±0.4 . When combined with the Run 1 measurement of the same processes, the signal significance is 3.8 standard deviations with 3.8 expected. The corresponding signal strength, relative to that of the SM Higgs boson, is 1.06−0.29+0.31 .
- Measurement of quarkonium production cross sections in pp collisions at $\sqrt{s}=$ 13 TeVPublication . CMS collaboration (2240 authors); Nayak, Aruna; Bargassa, Pedrame; Beirão Da Cruz E Silva, Cristóvão; Di Francesco, Agostino; Faccioli, Pietro; Galinhas, Bruno; Gallinaro, Michele; Hollar, Jonathan; Leonardo, Nuno; Lloret Iglesias, Lara; Seixas, Joao; Strong, Giles; Toldaiev, Oleksii; Vadruccio, Daniele; Varela, Joao; Vischia, Pietro; David Tinoco Mendes, Andre; Silva, Pedro; Musella, PasqualeDifferential production cross sections of prompt J/ψ and ψ(2S) charmonium and ϒ(nS) ( n=1,2,3 ) bottomonium states are measured in proton–proton collisions at s=13TeV , with data collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 2.3 fb −1 for the J/ψ and 2.7 fb −1 for the other mesons. The five quarkonium states are reconstructed in the dimuon decay channel, for dimuon rapidity |y|<1.2 . The double-differential cross sections for each state are measured as a function of y and transverse momentum, and compared to theoretical expectations. In addition, ratios are presented of cross sections for prompt ψ(2S) to J/ψ , ϒ(2S) to ϒ(1S) , and ϒ(3S) to ϒ(1S) production.