256 research outputs found
Zwischen Kommerzialisierung und Autarkie Sklavereisysteme des maritimen Südostasiens im Zeitalter der Ostindienkompanien
Radioaktivität in Fischen und anderen Meerestieren aus der Nordsee. Auswirkung der 1994 geänderten Genehmigung für Sellafield auf die Strahlenexposition der Bevölkerung
A subject of a change of authorised limits in 1994 for
the discharge of liquid radioactive waste by the reprocessing plant Sellafield (UK) was an increase of these
limits for certain radionuclides (3H, 14C, 60Co, 99Tc and
129I). It is investigated now how the radioactivity in marine biota from the North Sea and subsequently the public
radiation exposure by ingestion has developed in the
years since 1994. This is based on a compartment model
for the Northeast Atlantic. Discharges of the reprocessing
plants Dounreay (UK) and La Hague (F) are included in the assessment. It is deduced that about 60 % of 137Cs in the North Sea originate presently in the remobilisation of old Sellafield discharges from the Irish Sea sediment. A comparison with measured biota data shows that the model is conservative in the most cases. The public radiation exposure from ingestion of fish, crustaceans and molluscs from the central North Sea as the sum over 12 considered radionuclides has decreased from 1992 to 1998 from 0,13 to 0,08 μSv·y–1. For the southward and northward joined regions it was a little bit smaller with a similar decreasing trend
Per què és tan difícil la construcció de la identitat política i cultural europea?
La consolidació i l’extensió de la integració és lenta i atzarosa ateses les nombroses dificultats a les quals ha de fer front una Unió Europea en procés de canvi constant. Dins del context general d’ampliació a l’Europa central i oriental, és necessari que Europa articuli la seva identitat política i cultural; consolidi i racionalitzi una política exterior i de seguretat comuna; aporti solucions a la complexitat que suposa l’establiment d’una política social europea; resolgui l’encaix de les regions dins l’organigrama de les institucions i polítiques comunitàries; i, finalment, gestioni de manera eficaç i humana els nous fluxos migratoris
Application of a steady states transport model to condensation of water droplets on a substrate
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