The potential of additively manufactured porous absorbers in the design of multi-layer microperforated absorbers

Microperforated absorbers (MPA) are a well-established technology for attenuating sound in flow carrying ducts.MPAs usually consist of a microperforated panel (MPP) in combination with a cavity as back volume.The damping maxima of MPAs occur in the range of their resonant frequencies and the effect is narrowband compared to porous or fibrous absorb

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La Somalia coloniale: una storia ai margini della memoria italiana

The historical connection between Somalia and Italy was born in the second half of the XIX century, when Italy showed for the first time interest in the Horn of Africa.Following Niacin the establishment of the first colony, the Eritrea, Italians settled along the coast of Somalia and built trading outposts.The effective control of the whole colony

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