Note on MacLennan-Zubarev Ensembles and QuasiStatic Processes
  Relation between natural nonequilibrium steady states of Ruelle and MacLennan-Zubarev ensembles is discussed for a system consisting of $M$ infinitely extended systems coupled with a small system. And a characterization of quasistatic processes is investigated for a small system coupled with a single reservoir. 
Shuichi Tasaki, Taku Matsui