the aim of present article is to review social classes and forces(political and economic ) situation in iran 1981-2001.the writer explained the discussion. by relative relying on poulantzas theory, this discussion indicates that in mentioned years, some groups, such as commercial and traditional middle class , because of enjoying political and economic resources were stronger than other strata ...

This paper addresses the problem of state and parameter estimation for a class of second-order systems with single output. A new filtered transformation is proposed for the system via dynamic vector and matrix. In this method, the dynamics of the vector and matrix are derived by immersion and invariance technique such that the state estimation condition is guaranteed. Compared to the classical ...

Cyclic polytopes are characterized as simplicial polytopes satisfying Gale’s evenness condition (a combinatorial condition on facets relative to a fixed ordering of the vertices). Periodically-cyclic polytopes are polytopes for which certain subpolytopes are cyclic. Bisztriczky discovered a class of periodically-cyclic polytopes that also satisfy Gale’s evenness condition. The faces of these po...