Black Rings and the Physical Process Version of the First Law of   Thermodynamics
  We consider the problem of physical process version of the first law of black ring thermodynamics in n-dimensional Einstein gravity with additional (p+1)-form field strength and dilaton fields. The first order variations of mass, angular momentum and local charge for black ring was derived. By means of them we prove the physical process version of the first law of thermodynamics for stationary black rings. 
Marek Rogatko