This current article focuses on “relation between human groups and natural disasters. Although natural disasters have caused considerable damages to the human world, but there is not enough research about the family in disasters. Family sociologists believe that changes in population, technology, modernity, politics, and mass media are effect on transforming structures, relationships, and behav...

The role of generalized Bowen-Franks groups (BF-groups) as topological conjugacy invariants for T automorphisms is studied. Using algebraic number theory, a link is established between equality of BFgroups for different automorphisms (BF -equivalence) and an identical position in a finite lattice (L-equivalence). Important cases of equivalence of the two conditions are proved. Finally, a topolo...

Indeed, Margulis [lo] announced that for the geodesic flow on a d-dimensional compact manifold of curvature 1 the number of periodic orbits 7 with (minimal) period r(1) I x is asymptotic to ecd-‘jx/(d 1)x. This result bears a striking resemblance to the prime number theorem. Parry and Pollicott [12], following earlier work by Bowen [2, 41, generalized Margulis’ theorem to weakly mixing Axiom A ...

Bowen in Guerin (1976) describes the family as the system in which every activity produces a reaction in one or more of its members. This system includes not only the family but also relatives. Every member is presumed to play a role which is relatively stable. A member has a degree of personal differentiation from family of origin, the ability to be one’s self in the presence of pressure that ...