2,101 research outputs found

    ALIMENTAÇÃO ESCOLAR E O ESTADO NUTRICIONAL DE CRIANÇAS E ADOLESCENTES EM UMA INSTITUIÇÃO PÚBLICA DE ENSINO EM ANÁPOLIS-GO

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    O Brasil vivencia um processo de transição nutricional (POPKIN, 2001) com uma redução na prevalência da desnutrição simultânea ao aumento de sobrepeso e obesidade (WANG; MONTEIRO; POPKIN, 2002). Dentre as causas relacionadas a este processo, estão mudanças no estilo de vida e padrão de consumo alimentar das crianças (ESCRIVÃO et al., 2000). Contudo, muitas crianças não estão sendo adequadamente avaliadas, a fim de prevenir e tratar essas condições (OLIVEIRA et al., 2003). Esse estudo objetiva avaliar o estado nutricional de crianças e adolescentes matriculados em uma escola pública. Será realizado um estudo transversal com uma amostra de 230 alunos, do 1º ao 5º ano, que se alimentem diariamente na escola. Para classificar o estado nutricional, será utilizado o Índice de Massa Corpórea, e para a anamnese alimentar, um recordatório de 24 horas. Será aplicado um questionário sobre o consumo alimentar para verificar a preferência dos escolares entre os serviços de alimentação na escola, além da avaliação da composição nutricional dos diferentes cardápios. Essa pesquisa permitirá identificar o perfil nutricional dos escolares avaliados, contribuindo para subsidiar o monitoramento de desvios nutricionais e de necessidades específicas de ações de promoção de saúde para essa população

    Prevalência e preditores do uso incorreto dos dispositivos inalatórios em pacientes portadores de Doença Pulmonar Obstrutiva Crônica Prevalence and predictors of incorrect use of inhaler devices in patients with COPD

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    Objetivo: Inferir a prevalência e preditores do uso incorreto dos dispositivos inalatórios em pacientes ambulatoriais portadores de doença pulmonar obstrutiva crônica (DPOC). Métodos: Foi realizado um estudo de corte transversal em pacientes portadores de DPOC atendidos no Ambulatório Central em Anápolis - Goiás. Resultados: A prevalência de indivíduos com uso incorreto do dispositivo de inalação foi de 96% (24 indivíduos). Observou-se que a média de erro entre o grupo que usava um dispositivo era significativamente menor que a do grupo que usava três dispositivos (p=0,04). Foi encontrada correlação negativa entre o número de erros e o VEF1 pós BD em litros (r=0,55; p=0,004), e uma regressão linear mostrou que o número de erros pode ser previsto pelo VEF1 pós BD em litros (p=0,004), que está inversamente relacionado ao número de erros ao usar o dispositivo. Conclusão: Conclui-se que o número de dispositivos inalatórios e a gravidade da doença respiratória são preditores do uso incorreto de dispositivos inalatórios em pacientes com DPOC

    A search for ultra-high-energy photons at the Pierre Auger Observatory exploiting air-shower universality

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    The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above ∼0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (Xmax_{max}) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1-10 EeV, a new analysis technique has been developed by combining the FD-based measurement of Xmax_{max} with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy

    Study on multi-ELVES in the Pierre Auger Observatory

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    Since 2013, the four sites of the Fluorescence Detector (FD) of the Pierre Auger Observatory record ELVES with a dedicated trigger. These UV light emissions are correlated to distant lightning strikes. The length of recorded traces has been increased from 100 μs (2013), to 300 μs (2014-16), to 900 μs (2017-present), to progressively extend the observation of the light emission towards the vertical of the causative lightning and beyond. A large fraction of the observed events shows double ELVES within the time window, and, in some cases, even more complex structures are observed. The nature of the multi-ELVES is not completely understood but may be related to the different types of lightning in which they are originated. For example, it is known that Narrow Bipolar Events can produce double ELVES, and Energetic In-cloud Pulses, occurring between the main negative and upper positive charge layer of clouds, can induce double and even quadruple ELVES in the ionosphere. This report shows the seasonal and daily dependence of the time gap, amplitude ratio, and correlation between the pulse widths of the peaks in a sample of 1000+ multi-ELVES events recorded during the period 2014-20. The events have been compared with data from other satellite and ground-based sensing devices to study the correlation of their properties with lightning observables such as altitude and polarity

    Outreach activities at the Pierre Auger Observatory

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    The ultra-high-energy cosmic-ray sky above 32 EeV viewed from the Pierre Auger Observatory

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    First results from the AugerPrime Radio Detector

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    Update of the Offline Framework for AugerPrime

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    Extraction of the Muon Signals Recorded with the Surface Detector of the Pierre Auger Observatory Using Recurrent Neural Networks

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    We present a method based on the use of Recurrent Neural Networks to extract the muon component from the time traces registered with water-Cherenkov detector (WCD) stations of the Surface Detector of the Pierre Auger Observatory. The design of the WCDs does not allow to separate the contribution of muons to the time traces obtained from the WCDs from those of photons, electrons and positrons for all events. Separating the muon and electromagnetic components is crucial for the determination of the nature of the primary cosmic rays and properties of the hadronic interactions at ultra-high energies. We trained a neural network to extract the muon and the electromagnetic components from the WCD traces using a large set of simulated air showers, with around 450 000 simulated events. For training and evaluating the performance of the neural network, simulated events with energies between 1018.5, eV and 1020 eV and zenith angles below 60 degrees were used. We also study the performance of this method on experimental data of the Pierre Auger Observatory and show that our predicted muon lateral distributions agree with the parameterizations obtained by the AGASA collaboration
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