Insects which are dormant in the tropical zone.

Sexual Selection in Tropical Insects

Mating Strategies of Tropical Insects

Comparative Study of the Way in Which Teachers are Assigned to Schools Abroad

Comparative Study of the Way in Which Teachers are Assigned to Schools Abroad R. Kachoueian Javaadi, Ph.D.* B. Shaahtaalebi, Ph.D.** M.A. Naadi, Ph.D.***   To find ways of improving the way in which Iranian teachers are assigned to schools abroad, a comparative study was conducted in order to look at way this task is done in the U.S., France, Germany, Canada, England, Russia, Aust...

Passalidae, Insects Which Live in Decaying Logs

Rings in which elements are the sum of an‎ ‎idempotent and a regular element

Let R be an associative ring with unity. An element a in R is said to be r-clean if a = e+r, where e is an idempotent and r is a regular (von Neumann) element in R. If every element of R is r-clean, then R is called an r-clean ring. In this paper, we prove that the concepts of clean ring and r-clean ring are equivalent for abelian rings. Further we prove that if 0 and 1 are the only idempotents...