8 research outputs found
Distribution of Hydroxyl Groups in Kukersite Shale Oil: Quantitative Determination Using Fourier Transform Infrared (FT-IR) Spectroscopy
No full textInhibition of photosynthesis of sunflower leaves by an endogenous solute and interdependence of different photosynthetic reactions
No full textDecomposition of gini and multivariate gini indices
No full textBrunnâMinkowski inequality, Completely Identical Distribution (CID) condition, CramĂ©r test, Multi-dimensional Gini index, Multilevel decomposition, Source decomposition, Subgroup decomposition,
The life cycle and number dynamics of the urban mallard population (Anas platyrhynchos, Anseriformes, Aves) in Moscow
No full text
Upper Limit on the Cosmic-ray Photon Flux Above 10**19-eV Using the Surface Detector of the Pierre Auger Observatory.
Get PDFA method is developed to search for air showers initiated by photons using
data recorded by the surface detector of the Auger Observatory. The approach is
based on observables sensitive to the longitudinal shower development, the
signal risetime and the curvature of the shower front. Applying this method to
the data, upper limits on the flux of photons of 3.8*10^-3, 2.5*10^-3, and
2.2*10^-3 km^-2 sr^-1 yr^-1 above 10^19 eV, 2*10^19 eV, and 4*10^19 eV are
derived, with corresponding limits on the fraction of photons being 2.0%, 5.1%,
and 31% (all limits at 95% c.l.). These photon limits disfavor certain exotic
models of sources of cosmic rays. The results also show that the approach
adopted by the Auger Observatory to calibrate the shower energy is not strongly
biased by a contamination from photons.Comment: 28 pages, 9 figures; v2: minor modifications; accepted by Astropart.
Phy
