Browsing by Autor "C. Aguirre"
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Item type: Item , A population‐based coprological study of human fascioliasis in a hyperendemic area of the Bolivian Altiplano(Wiley, 1997) J. Guillermo Esteban; ANDRIE BON A. FLORES; René Angles; W Strauss; C. Aguirre; Santiago Mas‐ComaThe community of Chijipata Alta, at an altitude of 3850 m, near the southern coast of Lake Titicaca in the northern Altiplano of Bolivia, was surveyed for human fascioliasis. The global prevalence (66.7%) and intensity (eggs per gram of faeces--epg: range: 24-4440; arithmetic mean: 1001; geometric mean: 390) proved to be the highest known in the world by means of coprological techniques. These results suggest the existence of highly hyperendemic subzones among the large human fascioliasis-endemic zone of the Bolivian northern Altiplano. Despite the decrease in prevalence and intensity from children (75.0%, 24-4440 epg) to adults (41.7%, 144-864 epg), our findings show that in an hyperendemic zone adult subjects either maintain the parasites acquired when young or are newly infected as the consequence of inhabiting a zone of high infection risk.Item type: Item , A study of the effect of molecular and aerosol conditions in the atmosphere on air fluorescence measurements at the Pierre Auger Observatory(Elsevier BV, 2010) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; E. J. Ahn; D. Allard; I. Allekotte; Jeff Allen; Jaime Álvarez-Muñiz; M. AmbrosioItem type: Item , An upper limit to the photon fraction in cosmic rays above 1019eV from the Pierre Auger Observatory(Elsevier BV, 2007) J. Abraham; M. Aglietta; C. Aguirre; D. Allard; I. Allekotte; P. Allison; C. Álvarez; Jaime Álvarez-Muñiz; M. Ambrosio; Luis A. AnchordoquiItem type: Item , Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory(Elsevier BV, 2007) J. Abraham; M. Aglietta; C. Aguirre; D. Allard; I. Allekotte; P. Allison; C. Álvarez; Jaime Álvarez-Muñiz; M. Ambrosio; Luis A. AnchordoquiItem type: Item , Arrival-time distribution of muons and electrons in large air showers observed at 5200m above sea level(American Institute of Physics, 1979) C. Aguirre; R. Anda; A. Trepp; F. Kakimoto; Y. Mizumoto; K. Suga; N. Izu; Y. Kamouchi; N. Inoue; Shinsuke KawaiAn experiment is going on at Mt. Chacaltaya in Bolivia (550 gcm−2 atmospheric depth) to observe arrival‐time distributions of muons and electrons in air showers above 1017 eV to study the early stage of longitudinal development related directly with the character of nuclear interactions and the composition of primary cosmic rays at these high energies. The preliminary results are presented at the Seminar.Item type: Item , Atmospheric effects on extensive air showers observed with the surface detector of the Pierre Auger observatory(Elsevier BV, 2009) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; E. J. Ahn; D. Allard; I. Allekotte; J. Allen; P. Allison; Jaime Álvarez-MuñizItem type: Item , Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei(Elsevier BV, 2008) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; D. Allard; I. Allekotte; Jeff Allen; P. Allison; Jaime Álvarez-Muñiz; M. AmbrosioItem type: Item , Electrons in large air showers observed at 5200 m above sea level(IOP Publishing, 1979) C. Aguirre; F. Kakimoto; K. Kamata; T. Kaneko; P. K. MacKeown; Y. Mizumoto; Kazuaki Murakami; M. Nagano; H. Nakatani; K. NishiResults are presented for the lateral distribution and the longitudinal development of electrons between an atmospheric depth of 550 g cm-2 and 1100 g cm-2 in air showers with sizes 3*106 to 5*109 observed at Mount Chacaltaya. The lateral distribution is compared with those determined at mountain altitudes and at sea level by other groups. The longitudinal development is also compared with the results of other groups and with theoretical predictions under various models of nuclear interactions.Item type: Item , ELEVADA PREVALENCIA DE BLASTOCYSTIS HOMINIS EN MANIPULADORES DE ALIMENTOS DE LOS MERCADOS PÚBLICOS DE LA ZONA SUD DE LA CIUDAD DE LA PAZ(2006) Victoria Muñoz; Carlos Frade; Magui Chipana; C. AguirreItem type: Item , Energy spectrum of surviving primary protons with energies(3÷30) TeV at5200 m a.s.l. and the cross-section for proton-air-nucleus collisions(Springer Science+Business Media, 1975) C. Aguirre; A. Trepp; G. R. Mejía; K. Murakami; K. Kamata; Y. Toyoda; Tetsuhiko Maeda; Chiaki Yokoyama; P. K. MacKeown; K. SugaItem type: Item , Erratum to “Atmospheric effects on extensive air showers observed with the surface detector of the Pierre Auger observatory” [Astroparticle Physics 32(2) (2009), 89–99](Elsevier BV, 2010) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; E. J. Ahn; D. Allard; I. Allekotte; J. Allen; P. Allison; Jaime Álvarez-MuñizItem type: Item , Experiment OMEGA —A proposal of cosmic ray experiment at Mt. Chacaltaya—(1993) C. Aguirre; N. Martinić; E. H. Shibuya; Osca Saaverd; Naoya Inoue; Y. Fujimoto; S. Hasegawa; K. Yokoi; T. Shibata; Akinori OhsawaAbstractItem type: Item , Field Evaluation of a Coproantigen Detection Test for Fascioliasis Diagnosis and Surveillance in Human Hyperendemic Areas of Andean Countries(Public Library of Science, 2012) M. Adela Valero; María Victoria Periago; Ignacio Pérez‐Crespo; René Angles; Fidel Villegas; C. Aguirre; W Strauss; José R. Espinoza; Patricia Herrera-Velit; Angélica TerashimaThe coproantigen-detection test allows for high sensitivity and specificity, fast large mass screening capacity, detection in the chronic phase, early detection of treatment failure or reinfection in post-treated subjects, and usefulness in surveillance programs. However, this technique falls short when evaluating the fluke burden on its own.Item type: Item , Limit on the diffuse flux of ultrahigh energy tau neutrinos with the surface detector of the Pierre Auger Observatory(American Physical Society, 2009) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; E. J. Ahn; D. Allard; I. Allekotte; Jeff Allen; P. Allison; Jaime Álvarez-MuñizData collected at the Pierre Auger Observatory are used to establish an upper limit on the diffuse flux of tau neutrinos in the cosmic radiation. Earth-skimming ${\ensuremath{\nu}}_{\ensuremath{\tau}}$ may interact in the Earth's crust and produce a $\ensuremath{\tau}$ lepton by means of charged-current interactions. The $\ensuremath{\tau}$ lepton may emerge from the Earth and decay in the atmosphere to produce a nearly horizontal shower with a typical signature, a persistent electromagnetic component even at very large atmospheric depths. The search procedure to select events induced by $\ensuremath{\tau}$ decays against the background of normal showers induced by cosmic rays is described. The method used to compute the exposure for a detector continuously growing with time is detailed. Systematic uncertainties in the exposure from the detector, the analysis, and the involved physics are discussed. No $\ensuremath{\tau}$ neutrino candidates have been found. For neutrinos in the energy range $2\ifmmode\times\else\texttimes\fi{}{10}^{17}\text{ }\text{ }\mathrm{eV}<{E}_{\ensuremath{\nu}}<2\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{eV}$, assuming a diffuse spectrum of the form ${E}_{\ensuremath{\nu}}^{\ensuremath{-}2}$, data collected between 1 January 2004 and 30 April 2008 yield a 90% confidence-level upper limit of ${E}_{\ensuremath{\nu}}^{2}d{N}_{{\ensuremath{\nu}}_{\ensuremath{\tau}}}/d{E}_{\ensuremath{\nu}}<9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{GeV}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}2}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }\text{ }{\mathrm{sr}}^{\ensuremath{-}1}$.Item type: Item , Muons in large air showers observed at 5200 m above sea level(IOP Publishing, 1979) C. Aguirre; A Treppi; F Kakimato; K Kamata; T. Kaneko; P. K. MacKeown; Y. Mizumoto; Kazuaki Murakami; H. Nakatani; K. NishiResults are presented for the lateral distribution of muons with energies above 600 MeV in air showers with electron sizes 107 to 109 observed at Mount Chacaltaya. Results are also presented for the muon size spectrum at 644 g cm-2 and the longitudinal development of muons from 550 g cm-2 to 990 g cm-2 for intensities 10-8 m-2 s-1 sr-1 to 10-10 m-2 s-1 sr-1.Item type: Item , Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>(American Physical Society, 2008) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; D. Allard; I. Allekotte; J. Allen; P. Allison; Jaime Álvarez-Muñiz; M. AmbrosioThe energy spectrum of cosmic rays above 2.5 x 10;{18} eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional, variantE;{-gamma}, at energies between 4 x 10;{18} eV and 4 x 10;{19} eV is 2.69+/-0.02(stat)+/-0.06(syst), steepening to 4.2+/-0.4(stat)+/-0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.Item type: Item , Simultaneous observation of families and accompanied air showers at Mt. Chacaltaya II(Elsevier BV, 1997) C. Aguirre; K. Hashimoto; K. Honda; N. Inoue; N. Kawasumi; N. Martinic; T. Matano; N. Ohmori; A. Ohsawa; F. OscoItem type: Item , Simultaneous observation of families and accompanied air showers at Mt. Chacaltaya. II. Study of the hadronic component in air showers(American Physical Society, 2000) C. Aguirre; Hiroshi Aoki; K. Hashimoto; K. Honda; N. Inoue; N. Kawasumi; Yoshikazu Maeda; N. Martinić; T. Matano; N. OhmoriAn experimental setup of an air shower array, hadron calorimeter, and emulsion chamber is being carried out at Mt. Chacaltaya (5200 m, Bolivia), in order to study the hadron interaction and the primary cosmic rays in the energy region exceeding ${10}^{15}$ eV. The number of hadrons in the air shower, detected by the hadron calorimeter, is discussed mainly in this paper. A comparison with the simulation shows that the number of hadrons in the air shower is not compatible with that of the simulation, indicating that the Feynman scaling law is violated more strongly than the one assumed in the simulation at ${10}^{16}$ eV. The average mass number of the primary cosmic rays, estimated from the distribution of the number of hadrons, is $〈\mathrm{ln}A〉=2.8\ifmmode\pm\else\textpm\fi{}0.5$ at ${10}^{16}$ eV.Item type: Item , Study of hadronic component in air showers at Mt. Chacaltaya(Elsevier BV, 2001) C. Aguirre; Hiroshi Aoki; K. Hashimoto; K. Honda; N. Inoue; N. Kawasumi; Yoshikazu Maeda; N. Martinić; N. Ohmori; A. OhsawaItem type: Item , The fluorescence detector of the Pierre Auger Observatory(Elsevier BV, 2010) J. Abraham; P. Abreu; M. Aglietta; C. Aguirre; E. J. Ahn; D. Allard; I. Allekotte; Jeff Allen; P. Allison; Jaime Álvarez-Muñiz