Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fourier Transform Ultrasound Spectroscopy For the Determination of Wave
  Propagation Parameters   The reported results for ultrasonic wave attenuation constant ({\alpha}) in
pure water show noticeable inconsistency in magnitude. A "Propagating-Wave"
model analysis of the most popular pulse-echo technique indicates that this is
a consequence of the inherent wave propagation characteristics in a bounded
medium. In the present work Fourier Transform Ultrasound Spectroscopy (FTUS) is
adopted to determine ultrasonic wave propagation parameters, the wave number
(k) and attenuation constant ({\alpha}) at 1MHz frequency in tri-distilled
water at room temperature (25oC). Pulse-echo signals obtained under same
experimental conditions regarding the exciting input signal and reflecting
boundary wall of the water container for various lengths of water columns are
captured. The Fast Fourier Transform (FFT) components of the echo signals are
taken to compute k, {\alpha} and r, the reflection constant at the boundary,
using Oak Ridge and Oxford method. The results are compared with existing
literature values.

28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
3
The categories of this paper are: physics