Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Feynman-Smoluchowski engine at high temperatures and the role of
  constraints   Feynman's ratchet and pawl is a paradigmatic model for energy conversion
using thermal fluctuations in the mesoscopic regime. Here, we optimize the
power output of the ratchet as a heat engine in the high temperatures limit,
and derive the universality of efficiency at maximum power up to second order,
using a non-linear approximation. On the other hand, the linear model may be
optimized by constraining the internal energy scales in different ways. It is
shown that simple constraints lead to well-known expressions of thermal
efficiency in finite-time thermodynamics. Thereby, the constrained ratchet, in
the linear regime, has been mapped to an effective finite-time thermodynamic
model.

13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess