Thermodynamic properties of rod-like chains: entropic sampling   simulations
  In this work we apply entropic sampling simulations to a three-state model which has exact solutions in the microcanonical and grand-canonical ensembles. We consider $N$ chains placed on an unidimensional lattice, such that each site may assume one of three-states: empty (state 1), with a single molecule energetically null (state 2), and with a single molecule with energy $\varepsilon$ (state 3). Each molecule, which we will treat here as dimers, consists of two monomers connected one to each other by a rod. The thermodynamic properties, such as internal energy, densities of dimers and specific heat were obtained as functions of temperature where the analytic results in the micro-canonical and grand-canonical ensembles were successfully confirmed by the entropic sampling simulations. 
Lucas S. Ferreira, Lucas N. Jorge, Alvaro A. Caparica, Denise A. do   Nascimento, J. Ricardo de Sousa, Minos A. Neto
cond-mat.stat-mech