On different $q$-systems in nonextensive thermostatistics
  It is known that the nonextensive statistics was originally formulated for the systems composed of subsystems having same $q$. In this paper, the existence of composite system with different $q$ subsystems is investigated by fitting the power law degree distribution of air networks with $q$-exponential distribution. Then a possible extension the nonextensive statistics to different $q$ systems is provided on the basis of an entropy nonadditivity rule and an unnormalized expectation of energy. 
Wei Li (ISMANS), Qiuping A. Wang (ISMANS), Laurent Nivanen (ISMANS),   Alain Le M\'ehaut\'e (ISMANS)