The spectral shape of one dimensional systems (describing for instance the behaviour of Frenkel excitons) is approached through the exactly solvable model of XXO Heisenberg quantum spin chain in a transverse magnetic field. Some results for finite size chains concerning 2N-point correlators are presented in details. In particular the finite lattice, finite temperature 2-point correlators are ex...

Performance of an air-standard Atkinson cycle is analyzed by using finite-time thermodynamics. The irreversible cycle model which is more close to practice is founded. In this model, the nonlinear relation between the specific heats of working fluid and its temperature, the friction loss computed according to the mean velocity of the piston, the internal irreversibility described by using the c...

We investigate the dynamic evolution and thermodynamic process of a driven quantum system immersed in finite-temperature heat bath. A Born-Markovian master equation is formally derived for time-dependent with discrete energy levels. This can be applied to situations broad range driving speeds bath temperatures thus used study finite-time thermodynamics even when nonadiabatic transition dissipat...

Finite-time thermodynamic models for an Otto cycle, an Atkinson cycle, an over-expansion Miller cycle (M1), an LIVC Miller cycle through late intake valve closure (M2) and an LIVC Miller cycle with constant compression ratio (M3) have been established. The models for the two LIVC Miller cycles are first developed; and the heat-transfer and friction losses are considered with the effects of real...