Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The thermodynamic hamiltonian for open systems   The variational method is very important in mathematical and theoretical
physics because it allows us to describe the natural systems by physical
quantities independently from the frame of reference used. A global and
statistical approach have been introduced starting from non-equilibrium
thermodynamics, obtaining the principle of maximum entropy generation for the
open systems. This principle is a consequence of the lagrangian approach to the
open systems. Here it will be developed a general approach to obtain the
thermodynamic hamiltonian for the dynamical study of the open systems. It
follows that the irreversibility seems to be the fundamental phenomenon which
drives the evolution of the states of the open systems.

20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
3
The categories of this paper are: physics