Grid is one of the most e ective new paradigms in large scale distributed computing. Only recently Petri nets have been adopted as a formal modeling framework for describing the speci c aspects of the Grid. In this paper we describe a Grid tool for High Energy Physics data analysis, and we show how modeling its architecture with nets-withinnets has led us to identify and solve a number of defec...

“realism” is a critical term which in its specific sense refers to a literary movement in mid-nineteenth century and in its general sense designates a style of writing that has continued into the contemporary period. the school principal, a short novel by jalal ale-ahmad, is a characteristic example of realism in its general sense in which the author attempts to represent people and social cond...

Let $p:Xlo B$ be a locally trivial principal G-bundle and $wt{p}:wt{X}lo B$ be a locally trivial principal $wt{G}$-bundle. In this paper, by using the structure of principal bundles according to transition functions, we show that $wt{G}$ is a covering group of $G$ if and only if $wt{X}$ is a covering space of $X$. Then we conclude that a topological space $X$ with non-simply connected universal...

This study aimed at exploring the influence of the role that a teacher employs on his/her professional success. The teacher role was investigated from a new outlook, Goffman's footing theory. According to Goffman (1981), a speaker's role can be classified into three categories of animator, author, and principal, characterized as the repeater of the ideas made by the others, the paraphraser of c...

samanidgovernment was established in the fourthcentury (ah) in the east of islamic caliphate, within a rich socio-cultural context. samanid dynasty needed to prove its rights and legitimacy because of its conflict with the political discourse of their rival governments. this had to be done by taking advantage of thevalues and conceptsembedded in the rational, cultural, and conceptual contextsan...