147 research outputs found

    Apophis planetary defense campaign

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    We describe results of a planetary defense exercise conducted during the close approach to Earth by the near-Earth asteroid (99942) Apophis during 2020 December–2021 March. The planetary defense community has been conducting observational campaigns since 2017 to test the operational readiness of the global planetary defense capabilities. These community-led global exercises were carried out with the support of NASA's Planetary Defense Coordination Office and the International Asteroid Warning Network. The Apophis campaign is the third in our series of planetary defense exercises. The goal of this campaign was to recover, track, and characterize Apophis as a potential impactor to exercise the planetary defense system including observations, hypothetical risk assessment and risk prediction, and hazard communication. Based on the campaign results, we present lessons learned about our ability to observe and model a potential impactor. Data products derived from astrometric observations were available for inclusion in our risk assessment model almost immediately, allowing real-time updates to the impact probability calculation and possible impact locations. An early NEOWISE diameter measurement provided a significant improvement in the uncertainty on the range of hypothetical impact outcomes. The availability of different characterization methods such as photometry, spectroscopy, and radar provided robustness to our ability to assess the potential impact risk

    Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at root s(NN)=2.76 TeV

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    The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| <0.7) is measured in Pb-Pb collisions at TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v (2)) represents the elliptic flow. The v (2) coefficient of inclusive electrons is measured in three centrality classes (0-10%, 10-20% and 20-40%) with the event plane and the scalar product methods in the transverse momentum (p (T)) intervals 0.5-13 GeV/c and 0.5-8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v (2) of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9 sigma in the interval 2 <p (T) <2.5 GeV/c in semi-central collisions (20-40%). The value of v (2) decreases towards more central collisions at low and intermediate p (T) (0.5 <p (T) <3 GeV/c). The v (2) of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 <y <4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium.Peer reviewe

    Centrality dependence of charged jet production in p–Pb collisions at √sNN = 5.02 TeV

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    Production of Σ(1385)± and Ξ(1530)0 in proton–proton collisions at √s = 7 TeV

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    The production of the strange and double-strange baryon resonances (Σ(1385)±, Ξ(1530)0) has been measured at mid-rapidity (|y| <0.5) in proton–proton collisions at s√ = 7 TeV with the ALICE detector at the LHC. Transverse momentum spectra for inelastic collisions are compared to QCD-inspired models, which in general underpredict the data. A search for the ϕ(1860) pentaquark, decaying in the Ξπ channel, has been carried out but no evidence is seen

    Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb collisions at root s(NN)=2.76TeV

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    Exposición al tabaco en telenovelas y películas: dejar de fumar e intentos de abandono de este hábito

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    Submitted by Regiane Silva ([email protected]) on 2018-08-01T17:51:18Z No. of bitstreams: 1 Exposição ao cigarro em telenovelas e filmes- tentativas de parar de fumar e abstinência.pdf: 608450 bytes, checksum: 18824dde7cd62840eb8eea096a2f487e (MD5)Approved for entry into archive by Regiane Silva ([email protected]) on 2018-08-02T15:06:25Z (GMT) No. of bitstreams: 1 Exposição ao cigarro em telenovelas e filmes- tentativas de parar de fumar e abstinência.pdf: 608450 bytes, checksum: 18824dde7cd62840eb8eea096a2f487e (MD5)Made available in DSpace on 2018-08-02T15:06:25Z (GMT). No. of bitstreams: 1 Exposição ao cigarro em telenovelas e filmes- tentativas de parar de fumar e abstinência.pdf: 608450 bytes, checksum: 18824dde7cd62840eb8eea096a2f487e (MD5) Previous issue date: 2017San Diego State University, San Diego, U.S.A.Fundação Oswaldo Cruz. Escola Nacional de Saúde Pública Sérgio Arouca. Rio de Janeiro, RJ, Brasil.San Diego State University, San Diego, U.S.A.San Diego State University, San Diego, U.S.A.San Diego State University, San Diego, U.S.A.O objetivo foi avaliar a existência de uma associação entre o fato de ver um ator fumando em telenovela brasileira, filme brasileiro ou filme internacional e as tentativas de parar de fumar e abstinência entre fumantes adultos brasileiros. Foram utilizados os dados de 39.425 participantes da versão brasileira do Global Adult Tobacco Survey. O estudo calculou a prevalência de ex-fumantes (ex-fumantes/ex-fumantes + fumantes atuais) e as proporções de fumantes atuais, ex-fumantes e indivíduos que nunca fumaram. Foi utilizada a regressão ponderada multivariada para testar associações significativas entre cessação e exposição ao tabagismo em telenovelas e filmes. Para fumantes atuais, as chances de tentar de parar foram significativamente mais altas entre aqueles que haviam visto ator fumando em filme brasileiro. Aqueles que acreditavam que o fumo causa doenças graves e tinham regras contra fumar em casa apresentavam chances significativamente maiores de terem tentativas de parar e de abstinência. A exposição ao tabagismo na mídia pode ser diferente em adultos e adolescentes. Fatores que influenciam as tentativas e o sucesso na cessação incluem as regras contra fumar em casa, a crença de que o fumo provoca doenças graves e receber informação sobre os perigos do tabagismo através da mídia.The objectives of this research were to evaluate whether there was an association between seeing an actor smoke in telenovelas, Brazilian films, or international films, and trying to quit and quitting among adult Brazilian smokers. Data from 39,425 participants in the Global Adult Tobacco Survey were used. Quit ratio (former smoker/former smoker + ever smoker) and proportions of current, former, and never smokers were calculated. Multivariable weighted regression was used to determine significant associations between quitting smoking and exposure to telenovelas and films. For current smokers, the odds of trying to quit were significantly higher among those who saw an actor smoking in a Brazilian film. Those who believed smoking caused serious illness and had rules in the home prohibiting smoking were significantly more likely to have tried to quit or had quit smoking. Exposure to smoking in the media may be different in adults than adolescents. Influential factors for trying to quit and quitting are rules prohibiting smoking at home, belief that smoking causes serious illness, and hearing about dangers of smoking in media.Este trabajo tiene el fin de evaluar si existe una asociación entre ver a un actor fumando en telenovelas brasileñas o películas internacionales y dejar de fumar o intentar dejarlo entre fumadores adultos brasileños. Se usaron datos de 39,425 participantes en la Global Adult Tobacco Survey. La ratio de abandono de este hábito (ex fumadores/ex fumadores + fumadores) y los porcentajes de fumadores habituales, ex fumadores y no fumadores también fueron calculados. Se usaron análisis de regresión multivariable para determinar asociaciones significativas entre dejar de fumar y la exposición a telenovelas y películas. Para los fumadores habituales, la probabilidad de intentar dejar de fumar fueron significativamente mayores entre quienes vieron a un actor fumando en una película brasileña. Aquellos que creyeron que fumar causaba enfermedades serias y tenían normas en casa prohibiendo fumar eran más significativamente propensos a haber intentado dejar de fumar o haberlo dejado. La exposición al tabaco en los medios audiovisuales puede diferir entre adultos y adolescentes. Existen factores que influencian intentar o dejar de fumar y son: normas prohibiendo fumar en casa, y la creencia de que el tabaco provoca enfermedades muy serias, así como informarse sobre los peligros del tabaco en los medios de comunicación

    Nuevas zonas vitivinícolas en México: concientización para la prevención de filoxera en ámbito bioético y sustentable

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    Viticulture in Mexico has increased. So it is important to know conditions that favor the appearance of pests and diseases typical of the crop, as well as its methods of prevention. Therefore, a systematized scientific review methodology was used to combine relevant information on phylloxera and its prevention methods. The results showed that the use of phylloxera resistant rootstocks such as 1103-P on clay loam soils is an efficient way to control their appearance and the future devastation of crops. Therefore, the objective of this review was to raise awareness of the importance of using rootstocks for the new viticultural zones in Mexico, as well as promoting viticulture from a bioethical and sustainable environment.La viticultura en México se ha incrementado, por lo que es esencial conocer las condiciones que favorecen la aparición de plagas y enfermedades típicas de este cultivo. Al respecto, se empleó como metodología una revisión científica sistematizada que permitiera conjuntar datos relevantes de la filoxera y sus métodos de prevención. Los resultados mostraron que el uso de portainjertos resistentes a filoxera como 1103-P en suelos franco-arcillosos es una manera eficiente de controlar las plagas y la futura devastación de los cultivos. De este modo, se da a conocer la importancia del uso de portainjertos para nuevas zonas vitivinícolas de México, además de promover la viticultura desde un ámbito bioético y sustentable
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