Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast ultrasonic imaging coupled to rheometry: principle and
  illustration   We describe a technique coupling standard rheology and ultrasonic imaging
with promising applications to characterization of soft materials under shear.
Plane wave imaging using an ultrafast scanner allows to follow the local
dynamics of fluids sheared between two concentric cylinders with frame rates as
high as 10,000 images per second, while simultaneously monitoring the shear
rate, shear stress, and viscosity as a function of time. The capacities of this
"rheo-ultrasound" instrument are illustrated on two examples: (i) the classical
case of the Taylor-Couette instability in a simple viscous fluid and (ii) the
unstable shear-banded flow of a non-Newtonian wormlike micellar solution.

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The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics