Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acoustic radiation force on small spheres due to transient acoustic
  fields   Acoustic radiation force is a net force experienced by an object under the
action of an acoustic wave. Most theoretical models require the acoustic wave
to be periodic, if not purely monofrequency, and are therefore irrelevant for
the study of acoustic radiation force due to acoustic pulses. Here, we
introduce the concept of finite-duration pulses, which is the most general
condition to derive the acoustic radiation force. In the case of small spheres,
we extend the Gor'kov to formula to unsteady acoustic fields such as traveling
pulses and interfering wave packets. In the latter case, our study suggests
that the concept of acoustic contrast is also relevant to express the acoustic
radiation force. For negative acoustic contrast particles, the acoustic
trapping region narrows with shorter pulses, whereas positive contrast
particles (such as biological cells) can fall in secondary traps when the pulse
width deviates from an optimal value. This theoretical insight may help to
improve the selectivity of pulsed acoustic tweezers.

32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys