Extension of the Wu-Jing equation of state (EOS) for highly porous   materials: thermoelectron based theoretical model
  A thermodynamic equation of state (EOS) for thermoelectrons is derived which is appropriate for investigating the thermodynamic variations along isobaric paths. By using this EOS and the Wu-Jing (W-J) model, an extended Hugoniot EOS model is developed which can predict the compression behavior of highly porous materials. Theoretical relationships for the shock temperature, bulk sound velocity, and the isentrope are developed. This method has the advantage of being able to model the behavior of porous metals over the full range of applicability of pressure and porosity, whereas methods proposed in the past have been limited in their applicability. 
H. Y. Geng, Q. Wu, H. Tan, L. Cai, and F. Jing
cond-mat.other cond-mat.mtrl-sci physics.flu-dyn