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The articles in this book deal with energetic hadron§processes near astrophysical compact objects, including§compact binary systems and active galactic nuclei. A variety§of observational results suggest that relativistic hadrons§can be produced in the vicinity of these objects. Amongthe§topics treated in detail are the question whether a large§fraction of the energy produced by active galactic nuclei is§channeled into a population of relativistic protons and the§problem of the origin of very high and ultra-high energy§gamma rays from galactic compact sources.