Gelungene Versöhnung - unsichere Zukunft? Zur Raison d'être der deutsch-französischen Beziehungen in der neuen Europäischen Union

"Die Frage nach der Notwendigkeit und Legitimität der deutsch-französischen Sonderbeziehung im Europa der 25 stellt sich nach der Ablehnung der Europäischen Verfassung in Frankreich und den Niederlanden sowie dem vorläufigen Scheitern der EU-Finanzverhandlungen umso dringlicher. Mit der Rolle und Perzeption der deutsch-französischen Zusammenarbeit in der erweiterten Europäischen Union setzte sich im Juni ein internationales Kolloquium mit dem Titel 'Gelungene Versöhnung – unsichere Zukunft?' in Erinnerung an Joseph Rovan auseinander, dessen Tagungsergebnisse das Dossier dokumentiert. Neben Beiträgen zur Bewertung der aktuellen Krise und den Herausforderungen an Deutschland und Frankreich, analysieren (weitere Beiträge) den Blick der anderen Mitgliedstaaten auf das 'couple'." (Autorenreferat

SN 2009bb: a Peculiar Broad-Lined Type Ic Supernova

Ultraviolet, optical, and near-infrared photometry and optical spectroscopy of the broad-lined Type Ic supernova (SN) 2009bb are presented, following the flux evolution from -10 to +285 days past B-band maximum. Thanks to the very early discovery, it is possible to place tight constraints on the SN explosion epoch. The expansion velocities measured from near maximum spectra are found to be only slightly smaller than those measured from spectra of the prototype broad-lined SN 1998bw associated with GRB 980425. Fitting an analytical model to the pseudo-bolometric light curve of SN 2009bb suggests that 4.1+-1.9 Msun of material was ejected with 0.22 +-0.06 Msun of it being 56Ni. The resulting kinetic energy is 1.8+-0.7x10^52 erg. This, together with an absolute peak magnitude of MB=-18.36+-0.44, places SN 2009bb on the energetic and luminous end of the broad-lined Type Ic (SN Ic) sequence. Detection of helium in the early time optical spectra accompanied with strong radio emission, and high metallicity of its environment makes SN 2009bb a peculiar object. Similar to the case for GRBs, we find that the bulk explosion parameters of SN 2009bb cannot account for the copious energy coupled to relativistic ejecta, and conclude that another energy reservoir (a central engine) is required to power the radio emission. Nevertheless, the analysis of the SN 2009bb nebular spectrum suggests that the failed GRB detection is not imputable to a large angle between the line-of-sight and the GRB beamed radiation. Therefore, if a GRB was produced during the SN 2009bb explosion, it was below the threshold of the current generation of gamma-ray instruments.Comment: Accepted for publication in Ap

2018 Research & Innovation Day Program

A one day showcase of applied research, social innovation, scholarship projects and activities.https://first.fanshawec.ca/cri_cripublications/1005/thumbnail.jp

A structural interpretation of the two components governing the kinetic fragility from the example of interpenetrated polymer networks

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