827 research outputs found

    Sleep Quality and Sleepiness in College Students

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    Objetivos: O sono ao demonstrar-se fundamental para o desenvolvimento do indivĂ­duo, despertando o interesse em investigar qualidade do sono em estudantes do ensino superior. Assim, pretendeu-se com o presente estudo, caracterizar as componentes da qualidade subjetiva do sono e sonolĂȘncia excessiva diurna numa amostra de estudantes do ensino superior. MĂ©todo: Aplicaram-se as versĂ”es portuguesas do Índice da qualidade do sono (PSQI-PT) e da Escala de SonolĂȘncia excessiva diurna (ESS), em 257 estudantes do ensino superior distribuĂ­dos por sete instituiçÔes de ensino superior. Resultados: A maioria dos participantes revelou subjetivamente uma mĂĄ qualidade do sono e referiu dormir mais de sete horas durante a semana, sendo este nĂșmero maior durante o fim de semana. A perceção da LatĂȘncia do Sono e da Disfunção Durante o Dia diferiu em função do sexo dos participantes. Os trabalhadores-estudantes mostraram percecionar uma fraca Qualidade Subjetiva do Sono e uma menor Duração do Sono. Encontrou-se uma correlação baixa com significĂąncia estatĂ­stica entre o PSQI-PT e a ESS. Apesar da maioria dos participantes da amostra percecionar uma mĂĄ qualidade do sono, tambĂ©m a maioria revelou uma eficiĂȘncia subjetiva do sono superior a 85,0%. ConclusĂ”es: Verificou-se que os participantes em estudo avaliaram subjetivamente a qualidade do sono como sendo pobre. Estudos futuros devem explorar possĂ­veis programas de prevenção (i.e., alimentação, TIC, exercĂ­cio fĂ­sico) que melhorem a qualidade subjetiva do sono

    Discurso econÎmico e política colonial no império Luso-Brasileiro (1750-1808)

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    O artigo reflete sobre a ação polĂ­tica do marquĂȘs de Pombal e de Dom Rodrigo de Souza Coutinho, comparando o conjunto de suas orientaçÔes no campo econĂŽmico e colocando em perspectiva a questĂŁo geral do reformismo ilustrado no mundo ibĂ©rico. A ambição geral Ă© a discussĂŁo de diferentes percursos no plano da histĂłria das ideias no sĂ©culo XVIII, mapeando o quadro de influĂȘncias ao discurso econĂŽmico e polĂ­tico dedicado Ă  concepção e execução das reformas, com destaque para a preocupação com o papel das colĂŽnias (o Brasil, essencialmente) na dinĂąmica econĂŽmica portuguesa ao longo da segunda metade do sĂ©culo XVIII

    Optimasi Portofolio Resiko Menggunakan Model Markowitz MVO Dikaitkan dengan Keterbatasan Manusia dalam Memprediksi Masa Depan dalam Perspektif Al-Qur`an

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    Risk portfolio on modern finance has become increasingly technical, requiring the use of sophisticated mathematical tools in both research and practice. Since companies cannot insure themselves completely against risk, as human incompetence in predicting the future precisely that written in Al-Quran surah Luqman verse 34, they have to manage it to yield an optimal portfolio. The objective here is to minimize the variance among all portfolios, or alternatively, to maximize expected return among all portfolios that has at least a certain expected return. Furthermore, this study focuses on optimizing risk portfolio so called Markowitz MVO (Mean-Variance Optimization). Some theoretical frameworks for analysis are arithmetic mean, geometric mean, variance, covariance, linear programming, and quadratic programming. Moreover, finding a minimum variance portfolio produces a convex quadratic programming, that is minimizing the objective function ðð„with constraintsð ð ð„ „ ðandðŽð„ = ð. The outcome of this research is the solution of optimal risk portofolio in some investments that could be finished smoothly using MATLAB R2007b software together with its graphic analysis

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

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    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

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    Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

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    Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (Ό̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ÂŻ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ÂŻ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),Ό̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| < 0.03 at 95% confidence level. [Figure not available: see fulltext.

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

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    Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at root s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

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