Seminários

Seminário de Mecânica Estatística

O seminário de Mecânica Estatística será apresentado na próxima
segunda-feira, 13/04/2015, às 11:00h, na sala A5-01 do Instituto de Física.
Será o primeiro do ano com um apresentador externo.

Título: Quadro Termodinâmico para Sistemas de Partículas Interagentes
Desprezando Ruído Térmico

Apresentador: Fernando D. Nobre (CBPF)

Resumo: A thermodynamical formalism is developed for a system of interacting
particles under overdamped motion, which is analyzed within
the framework of nonextensive statistical mechanics. It amounts to express
the interaction energy of the system in terms of a temperature theta,
conjugated to a generalized entropy s_q, with q=2. Since theta
assumes much higher values than those of typical room temperatures
T<<theta, the thermal noise can be neglected for this system (T/theta~=0).
The introduction of a work term delta W which, together with the heat
contribution (delta Q = theta ds_q), allows for the statement of a
proper energy conservation law that is analogous to the first law of
thermodynamics. These definitions lead to the derivation of an
equation of state and to the characterization of s_q-adiabatic and
theta-isothermic transformations. On this basis, a Carnot cycle is
constructed, whose efficiency is shown to be
\eta=1-(theta_2/theta_1), where theta_1 and theta_2 are
the effective temperatures of the two isothermic transformations, with
theta_1>theta_2. All results presented are consistent with those
of standard thermodynamics for T>0, opening the possibility for further
physical consequences.