332 research outputs found
ART2 et apprentissage de séquences de mots : l'ordre compte
ISBN : 978-2-9532965-0-1Un réseau Adaptive Resonance Theory a été utilisé pour simuler l'apprentissage des formes orthographiques des mots vus par les enfants. Il a été démontré qu'une modélisation par carte auto-organisatrice permet de rendre compte des performances de l'enfant si on conserve les probabilités d'apparition des mots de la base d'apprentissage. Nous montrons dans cet article avec ART2, que l'ordre d'apparition des mots joue aussi un rôle significatif dans la discrimination des mots plus ou moins orthographiquement voisins. Il en découle une hypothése de construction de corpus favorable é l'apprentissage de la lecture de ce type de mots
El resum: més del mateix
Abstract not availabl
Thomson Scattering of Coherent Diffraction Radiation by an Electron Bunch
The paper considers the process of Thomson scattering of coherent diffraction
radiation (CDR) produced by the preceding bunch of the accelerator on one of
the following bunches. It is shown that the yield of scattered hard photons is
proportional to N, where N is the number of electrons per bunch. A
geometry is chosen for the CDR generation and an expression is obtained for the
scattered photon spectrum with regard to the geometry used, that depends in an
explicit form on the bunch size. A technique is proposed for measuring the
bunch length using scattered radiation characteristics.Comment: 14 pages, LATEX, 6 ps.gz figures, submitted to Phys.Rev.
All-sky Search for High-Energy Neutrinos from Gravitational Wave Event GW170104 with the ANTARES Neutrino Telescope
Advanced LIGO detected a significant gravitational wave signal (GW170104)
originating from the coalescence of two black holes during the second
observation run on January 4, 2017. An all-sky high-energy
neutrino follow-up search has been made using data from the ANTARES neutrino
telescope, including both upgoing and downgoing events in two separate
analyses. No neutrino candidates were found within s around the GW
event time nor any time clustering of events over an extended time window of
months. The non-detection is used to constrain isotropic-equivalent
high-energy neutrino emission from GW170104 to less than
erg for a spectrum
The ANTARES Collaboration: Contributions to ICRC 2017 Part I: Neutrino astronomy (diffuse fluxes and point sources)
Papers on neutrino astronomy (diffuse fluxes and point sources, prepared for
the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by
the ANTARES Collaboratio
The ANTARES Collaboration: Contributions to ICRC 2017 Part III: Searches for dark matter and exotics, neutrino oscillations and detector calibration
Papers on the searches for dark matter and exotics, neutrino oscillations and
detector calibration, prepared for the 35th International Cosmic Ray Conference
(ICRC 2017, Busan, South Korea) by the ANTARES Collaboratio
The ANTARES Collaboration: Contributions to ICRC 2017 Part II: The multi-messenger program
Papers on the ANTARES multi-messenger program, prepared for the 35th
International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the
ANTARES Collaboratio
The Antares Collaboration : Contributions to the 34th International Cosmic Ray Conference (ICRC 2015, The Hague)
The ANTARES detector, completed in 2008, is the largest neutrino telescope in the Northern hemisphere. Located at a depth of 2.5 km in the Mediterranean Sea, 40 km off the Toulon shore, its main goal is the search for astrophysical high energy neutrinos. In this paper we collect the 21 contributions of the ANTARES collaboration to the 34th International Cosmic Ray Conference (ICRC 2015). The scientific output is very rich and the contributions included in these proceedings cover the main physics results, ranging from steady point sources, diffuse searches, multi-messenger analyses to exotic physics
Limits on the nuclearite flux using the ANTARES neutrino telescope
In this work, a search for nuclearites of strange quark matter by using nine
years of ANTARES data taken in the period 2009-2017 is presented. The passage
through matter of these particles is simulated %according to the model of de
R\'{u}jula and Glashow taking into account a detailed description of the
detector response to nuclearites and of the data acquisition conditions. A
down-going flux of cosmic nuclearites with Galactic velocities () was considered for this study. The mass threshold for detecting these
particles at the detector level is \mbox{ GeV/c}.
Upper limits on the nuclearite flux for masses up to GeV/c at
the level of cm s sr are
obtained. These are the first upper limits on nuclearites established with a
neutrino telescope and the most stringent ever set for Galactic velocities.Comment: 17 pages, 7 figure
ANTARES search for point-sources of neutrinos using astrophysical catalogs: a likelihood stacking analysis
A search for astrophysical point-like neutrino sources using the data
collected by the ANTARES detector between January 29, 2007 and December 31,
2017 is presented. A likelihood stacking method is used to assess the
significance of an excess of muon neutrinos inducing track-like events in
correlation with the location of a list of possible sources. Different sets of
objects are tested in the analysis: a) a sub-sample of the \textit{Fermi} 3LAC
catalog of blazars, b) a jet-obscured AGN population, c) a sample of soft
gamma-ray selected radio galaxies, d) a star-forming galaxy catalog , and e) a
public sample of 56 very-high-energy track events from the IceCube experiment.
None of the tested sources shows a significant association with the sample of
neutrinos detected by ANTARES. The smallest p-value is obtained for the radio
galaxies catalog with an equal weights hypothesis, with a pre-trial p-value
equivalent to a excess, equivalent to
post-trial.
In addition, the results of a dedicated analysis for the blazar MG3
J225517+2409 are also reported: this source is found to be the most significant
within the \textit{Fermi} 3LAC sample, with 5 ANTARES events located at less
than one degree from the source. This blazar showed evidence of flaring
activity in \textit{Fermi} data, in space-time coincidence with a high-energy
track detected by IceCube. An \emph{a posteriori} significance of for the combination of ANTARES and IceCube data is reported
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