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<title>30th International Cosmic Ray Conference</title>
<description>The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.</description>
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 <title>Barometric Effect in Extensive Air Showers in ARGO-YBJ experiment</title>
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 <abstract>The relation between atmospheric pressure and trigger rate variation
is presented after live time correction in extensive air shower detected
by the ARGO-YBJ experiment (4300 m a.s.l., Tibet, P.R.China)
In particular we determine Fourier components of the temperature
near by the detector and atmospheric pressure in solar time, sidereal time
and antisidereal time. Also we obtain barometric coefficients with 
different numbers of hits in an event after reconstruction corresponding
to energies of primary particles, which confirmed the absorption
length measured at Yangbajing.</abstract>
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