2,014 research outputs found
Muon content of ultra-high-energy air showers: Yakutsk data versus simulations
We analyse a sample of 33 extensive air showers (EAS) with estimated primary
energies above 2\cdot 10^{19} eV and high-quality muon data recorded by the
Yakutsk EAS array. We compare, event-by-event, the observed muon density to
that expected from CORSIKA simulations for primary protons and iron, using
SIBYLL and EPOS hadronic interaction models. The study suggests the presence of
two distinct hadronic components, ``light'' and ``heavy''. Simulations with
EPOS are in a good agreement with the expected composition in which the light
component corresponds to protons and the heavy component to iron-like nuclei.
With SYBILL, simulated muon densities for iron primaries are a factor of \sim
1.5 less than those observed for the heavy component, for the same
electromagnetic signal. Assuming two-component proton-iron composition and the
EPOS model, the fraction of protons with energies E>10^{19} eV is
0.52^{+0.19}_{-0.20} at 95% confidence level.Comment: 8 pages, 3 figures; v2: replaced with journal versio
On Testing Entropic Inequalities for Superconducting Qudit
The aim of this work is to verify the new entropic and information
inequalities for non-composite systems using experimental density
matrix of the qudit state, measured by the tomographic method in a multi-level
superconducting circuit. These inequalities are well-known for bipartite and
tripartite systems, but have never been tested for superconducting qudits.
Entropic inequalities can also be used to evaluate the accuracy of experimental
data and the value of mutual information, deduced from them, may charachterize
correlations between different degrees of freedom in a noncomposite system.Comment: 5 pages, 6 figure
Dependence of the Energy Spectrum of UHE Cosmic Rays on the Latitude of an Extensive Air Shower Array
Several energy spectra of cosmic rays with energies E_0 \geq 10^17 eV
measured at the Yakutsk EAS, AGASA, Haverah Park, HiRes, Auger, and SUGAR
arrays are considered. It is shown that the fairly good mutual agreement of the
spectrum shapes can be achieved if the energy of each spectrum is multiplied by
a factor K specific for each spectrum. These factors exhibit a pronounced
dependence on the latitude of the above-mentioned arrays.Comment: 4 pages, 4 figure
Atmospheric teleconnection patterns and eddy kinetic energy content: wavelet analysis
International audienceIn this paper, we employ a non-decimated wavelet decomposition to analyse long-term variations of the teleconnection pattern monthly indices (the North Atlantic Oscillation and the Southern Oscillation) and the relationship of these variations with eddy kinetic energy contents (KE) in the atmosphere of mid-latitudes and tropics. Major advantage of using this tool is to isolate short- and long-term components of fluctuations. Such analysis allows revealing basic periodic behaviours for the North Atlantic Oscillations (NAO) indices such as the 4-8-year and the natural change of dominant phase. The main results can be posed as follows. First, if the phases of North Atlantic and Southern Oscillations vary synchronously with the 4-8-year period then the relationship between the variations of the NAO indices and the KE contents is the most appreciable. Second, if the NAO phase tends to abrupt changes then the impact of these variations on the eddy kinetic energy contents in both mid-latitudes and tropics is more significant than for the durational dominance of certain phase
MODERN INFORMATION TECHNOLOHY AND MEDICAL EDUCATION
The article covers patterns of usage of IT in medicine and teaching Medical Informatics and Statistics course which refers to disciplines of the mathematical and natural science cycle. Teaching is carried out on all the departments of I.M. Sechenov First Moscow State Medical University. There are considerably more hours of learning for students of Public Healthy Department than for students of others departments.
For purposes of teaching techniques development was conducted pedagogical content review, were compiled assembling of data on attendance and performing level. There are made recommendations connected to modern methodical developments aimed at quality of education improvement and drawn plan of teaching methods and education forms improvement.
Key words: telemedicine, Medical informatics, Medical statistaics, Information technology, teaching methods and education forms
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