AbstractIn the present study, attempt has been made to examine the effectiveness of peer and teacher scaffolding in reading comprehension of intermediate EFL students in symmetrical and asymmetrical groups. To do so, sixty intermediate students were purposively selected out of 150 intermediate students in Hamadan Islamic Azad University and Kish Language Institute in Hamadan. They were divided ...

Nowadays, due to inherent complexity of real optimization problems, it has always been a challenging issue to develop a solution algorithm to these problems. Single row facility layout problem (SRFLP) is a NP-hard problem of arranging a number of rectangular facilities with varying length on one side of a straight line with aim of minimizing the weighted sum of the distance between all facility...

We focus on the random generation of SAT instances that have properties similar to real-world instances. It is known many industrial instances, even with a great number variables, can be solved by clever solver in reasonable amount time. This not possible, general, classical randomly generated provide different model called \emph{scale-free instances}. based use non-uniform probability distribu...

Dominions, in the sense of Isbell, are investigated in the context of decomposable varieties of groups. An upper and lower bound for dominions in such a variety is given in terms of the two varietal factors, and the internal structure of the group being analyzed. Finally, the following result is established: If a variety N has instances of nontrivial dominions, then for any proper subvariety Q ...