Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sound speed in water-saturated glass beads as a function of frequency
  and porosity   Sound propagation in water-saturated granular sediments is known to depend on
the sediment porosity, but few data in the literature address both the
frequency and porosity dependency. To begin to address this deficiency, a
fluidized bed technique was used to control the porosity of an artificial
sediment composed of glass spheres of 265 {\mu}m diameter. Time-of-flight
measurements and the Fourier phase technique were utilized to determine the
sound speed for frequencies from 300 to 800 kHz and porosities from 0.37 to
0.43. A Biot-based model qualitatively describes the porosity dependence.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex