HETEROGENEITY OF RECREATIONISTS IN A PARK AND PROTECTED AREA.

Heterogeneity of recreationists in a park and protected area.

Limited information and resources have Stacks and Exhaust Parts caused many parks and protected areas (PPAs) to functionally manage recreationists as a single homogeneous group, despite potential negative social and ecological consequences.We aimed to evaluate the homogeneity of recreationists at the Valentine National Wildlife Refuge (NWR) by 1) q

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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 Hair S

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