Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and demonstration of an acoustic right-angle bend   In this paper, we design, fabricate and experimentally characterize a
broadband acoustic right-angle bend device in air. Perforated panels with
various hole-sizes are used to construct the bend structure. Both the simulated
and the experimental results verify that acoustic beam can be rotated
effectively through the acoustic bend in a wide frequency range. This model may
have potential applications in some areas such as sound absorption and acoustic
detection in pipeline.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys