991 resultados para Nicole, Pierre, 1625-1695
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From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV equivalent to 10(18) eV), respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section. (C) 2009 Elsevier B.V. All rights reserved.
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The Pierre Auger Collaboration has reported. evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > E(th) = 5.5 x 10(19) eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at E > E(th) are heavy nuclei with charge Z, the proton component of the sources should lead to excesses in the same regions at energies E/Z. We here report the lack of anisotropies in these directions at energies above E(th)/Z (for illustrative values of Z = 6, 13, 26). If the anisotropies above E(th) are due to nuclei with charge Z, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.
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We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved.
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Since data-taking began in January 2004, the Pierre Auger Observatory has been recording the count rates of low energy secondary cosmic ray particles for the self-calibration of the ground detectors of its surface detector array. After correcting for atmospheric effects, modulations of galactic cosmic rays due to solar activity and transient events are observed. Temporal variations related with the activity of the heliosphere can be determined with high accuracy due to the high total count rates. In this study, the available data are presented together with an analysis focused on the observation of Forbush decreases, where a strong correlation with neutron monitor data is found.
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The Pierre Auger Observatory is a detector for ultra-high energy cosmic rays. It consists of a surface array to measure secondary particles at ground level and a fluorescence detector to measure the development of air showers in the atmosphere above the array. The ""hybrid"" detection mode combines the information from the two subsystems. We describe the determination of the hybrid exposure for events observed by the fluorescence telescopes in coincidence with at least one water-Cherenkov detector of the surface array. A detailed knowledge of the time dependence of the detection operations is crucial for an accurate evaluation of the exposure. We discuss the relevance of monitoring data collected during operations, such as the status of the fluorescence detector, background light and atmospheric conditions, that are used in both simulation and reconstruction. (C) 2010 Elsevier B.V. All rights reserved.
Resumo:
The Pierre Auger Observatory is a hybrid detector for ultra-high energy cosmic rays. It combines a surface array to measure secondary particles at ground level together with a fluorescence detector to measure the development of air showers in the atmosphere above the array. The fluorescence detector comprises 24 large telescopes specialized for measuring the nitrogen fluorescence caused by charged particles of cosmic ray air showers. In this paper we describe the components of the fluorescence detector including its optical system, the design of the camera, the electronics, and the systems for relative and absolute calibration. We also discuss the operation and the monitoring of the detector. Finally, we evaluate the detector performance and precision of shower reconstructions. (C) 2010 Elsevier B.V All rights reserved.
Measurement of the energy spectrum of cosmic rays above 10(18) eV using the Pierre Auger Observatory
Resumo:
We report a measurement of the flux of cosmic rays with unprecedented precision and Statistics using the Pierre Auger Observatory Based on fluorescence observations in coincidence with at least one Surface detector we derive a spectrum for energies above 10(18) eV We also update the previously published energy spectrum obtained with the surface detector array The two spectra are combined addressing the systematic uncertainties and, in particular. the influence of the energy resolution on the spectral shape The spectrum can be described by a broken power law E(-gamma) with index gamma = 3 3 below the ankle which is measured at log(10)(E(ankle)/eV) = 18 6 Above the ankle the spectrum is described by a power law with index 2 6 followed by a flux suppression, above about log(10)(E/eV) = 19 5, detected with high statistical significance (C) 2010 Elsevier B V All rights reserved
Resumo:
The air fluorescence detector of the Pierre Auger Observatory is designed to perforin calorimetric measurements of extensive air showers created by Cosmic rays of above 10(18) eV. To correct these measurements for the effects introduced by atmospheric fluctuations, the Observatory contains a group Of monitoring instruments to record atmospheric conditions across the detector site, ail area exceeding 3000 km(2). The atmospheric data are used extensively in the reconstruction of air showers, and are particularly important for the correct determination of shower energies and the depths of shower maxima. This paper contains a summary of the molecular and aerosol conditions measured at the Pierre Auger Observatory since the start of regular operations in 2004, and includes a discussion of the impact of these measurements oil air shower reconstructions. Between 10(18) and 10(20) eV, the systematic Uncertainties due to all atmospheric effects increase from 4% to 8% in measurements of shower energy, and 4 g cm(-2) to 8 g cm(-2) in measurements of the shower maximum. (C) 2010 Elsevier B.V. All rights reserved.
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This studyfocuses on the theory of intertextuality and on the most important approachesof Julia Kristeva, Gerard Genette and Ronald Barthestothis theory. It also examines the intertextual relationships in twoworksof Jorge Luis Borges:Pierre Menard, author of the Quixoteand The library of Babel. This studyconcludes that intertextual relations and issues are very often used in the works of Jorge Luis Borges. Analysis of histwoworks has shown the most obvious indicators of intertextuality such as allusions, quotations and references.
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Some themes discussed are: • Military service—(1) • Occupation—retail (2) • Occupation—Stride Rite Shoes (10) • Occupation—law (11-12) • Life in Augusta—grandparents (2) • Life in Augusta—childhood (3) • Interfaith interaction (5) • Yiddish (4) • Jewish education (5, 8, 10) • Synagogue (5) • Holidays—Christmas (5-6) • Holidays—Passover/Sukkot (6) • Dating— interfaith marriage (7-8) • Jewish Identity (5, 9-10)
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Some themes discussed are: • Jewish identity—prayer (1, 3) • Jewish identity—modern changes (3) • Jewish education—Hebrew/Sunday School (1, 4, 5) • Food—family picnics (2) • Food—favorites (13) • Food—kosher (14) • Occupation—store/tailoring (2) • Occupation—law (8-9) • Occupation—legislature (8-9) • Education—Bowdoin (8) • Education—Harvard Law (8) • Marriage—parents (9-10) • Intermarriage (11) • Social life—Center Youth (11) • Dating—non-Jews (12)
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According to Bourdieu (1994), there are social camps where the economic logic works upside down. Therefore, the expression ¿family business¿ is paradoxical because inside it resides two distinct and, sometimes, antagonistic logics: the business logic, whose goal is the profit, and the family logic, which aims at the common welfare. That is why one must consider the symbolical exchanges influences on the social relations more than in any other kind of company. Based on these concepts, this research presents an overview of the small and medium brazilian family business universe.
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Este estudo sobre o romance Le Désert mauve, da escritora quebequense Nicole Brossard, foi desenvolvido tendo, como instrumentos de análise, a tradução e a identidade da América ou a americanidade. Esses temas foram determinados levando-se em conta a estrutura e o tema da obra, focalizados na figura do(a) tradutor(a), figura essa representativa da era pós-moderna. Os aspectos relacionados às questões feministas foram, até certo ponto, também abordados, principalmente pelo fato de a autora ocupar posição de destaque no meio feminista. Tendo-se em vista as especificidades do corpus, apresentamos, em um primeiro capítulo, uma contextualização do Quebec, abordando a literatura, o pós-modernismo e o feminismo quebequenses. O segundo capítulo é dedicado à obra brossardiana e seu impacto sobre o meio litérario, a partir do Quebec. Nossa análise propriamente dita do romance é apresentada no terceiro capítulo. Este trabalho tem como objetivo refletir sobre a problemática da tradução partindo-se de uma abordagem transcultural, isto é, dando-se ênfase à transformação que ela provoca. Esses traços do « novo » serão colocados em diálogo com os elementos próprios da América, como as referências culturais, a mescla de gêneros, a linguagem dos espaços abertos, as utopias, as buscas. Nosso estudo fundamenta-se basicamente nas teorias de Julia Kristeva, no que diz respeito à linguagem, ao texto; nas teorias de Henri Meschonnic e Sherry Simon, para os estudos da tradução e de Gérard Bouchard, quanto às questões que se referem à americanidade.
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This doctoral dissertation analyzes two novels by the American novelist Robert Coover as examples of hypertextual writing on the book bound page, as tokens of hyperfiction. The complexity displayed in the novels, John's Wife and The Adventures of Lucky Pierre, integrates the cultural elements that characterize the contemporary condition of capitalism and technologized practices that have fostered a different subjectivity evidenced in hypertextual writing and reading, the posthuman subjectivity. The models that account for the complexity of each novel are drawn from the concept of strange attractors in Chaos Theory and from the concept of rhizome in Nomadology. The transformations the characters undergo in the degree of their corporeality sets the plane on which to discuss turbulence and posthumanity. The notions of dynamic patterns and strange attractors, along with the concept of the Body without Organs and Rhizome are interpreted, leading to the revision of narratology and to analytical categories appropriate to the study of the novels. The reading exercised throughout this dissertation enacts Daniel Punday's corporeal reading. The changes in the characters' degree of materiality are associated with the stages of order, turbulence and chaos in the story, bearing on the constitution of subjectivity within and along the reading process. Coover's inscription of planes of consistency to counter linearity and accommodate hypertextual features to the paper supported narratives describes the characters' trajectory as rhizomatic. The study led to the conclusion that narrative today stands more as a regime in a rhizomatic relation with other regimes in cultural practice than as an exclusively literary form and genre. Besides this, posthuman subjectivity emerges as class identity, holding hypertextual novels as their literary form of choice.
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A proposta deste trabalho é discutir as características e as possibilidades de uso, para a pesquisa histórica, do diário da sra. Deffontaines e da autobiografia de Pierre Deffontaines, bem como dos depoimentos orais concedidos por seus descendentes. A idéia básica é analisar os pontos de convergência e os conflitos de memória apresentados nesses três tipos de fontes, e seus significados para a compreensão da trajetória intelectual de Deffontaines. A hipótese central que norteia a análise é a de que as três fontes revelam memórias divergentes, na medida em que as três modalidades de relato tinham objetivos diversos, foram produzidas em momentos distintos e por pessoas de gerações também diferentes: Deffontaines, sua mulher, sua filha e seu neto. Nosso objetivo será exatamente mostrar como e por que se delinearam essas memórias diferenciadas.