Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A direct time-domain FEM modeling of broadband frequency-dependent
  absorption with the presence of matrix fractional power: Model I   The frequency-dependent attenuation of broadband acoustics is often
confronted in many different areas. However, the related time domain simulation
is rarely found in literature due to enormous technical difficulty. The
currently popular relaxation models with the presence of convolution operation
require some material parameters which are not readily available. In this
study, three reports are contributed to address broadband ultrasound
frequency-dependent absorptions using the readily available empirical
parameters. This report is the first in series concerned with developing a
direct time domain FEM formulation. The next two reports are about the
frequency decomposition model and the fractional derivative model.

3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
16
The categories of this paper are: stat