Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acoustic Emission from Breaking a Bamboo Chopstick   The acoustic emission from breaking a bamboo chopstick or a bundle of
spaghetti is found to exhibit similar behavior as the famous seismic laws of
Gutenberg-Richter, Omori, and Bath. By use of a force-sensing detector, we
establish a positive correlation between the statistics of sound intensity and
the magnitude of tremor. We also manage to derive these laws analytically
without invoking the concept of phase transition, self-organized criticality,
or fractal. Our model is deterministic and relies on the existence of a
structured cross section, either fibrous or layered. This success at explaining
the power-law behavior supports the proposal that geometry is sometimes more
important than mechanics.

15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg