Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical description of the blood flow from the internal jugular vein to
  the right atrium of the heart: new ultrasound application perspectives   This is a self-published methodological note distributed under the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0/),
which permits unrestricted use, distribution, and reproduction in any medium,
provided the original work is properly cited. The note contains an original
reasoning of mine and the goal to share thoughts and methodologies, not
results. Therefore before using the contents of these notes, everyone is
invited to verify the accuracy of the assumptions and conclusions.

25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex