The group Z acts on the real line R by translation. It is difficult to find a nontrivial group action which is easier to understand: the orbit of every point moves off to infinity at a steady and predictable rate, and the group action preserves the usual Euclidean metric on R. Of course, this action is a covering space action, and the quotient space of the action is the circle, which is complet...

Semantic analysis (SA) is a central operation in natural language processing. We can consider it as the resolution of 5 problems: lexical ambiguity, references, prepositional attachments, interpretative paths and lexical functions instanciation. In this article, we show the importance of this last and explain why these tasks should be simultaneously carried out using thematic (conceptual vector...

background: alpha particle irradiation from radon progeny is one of the major natural sources of effective dose in the public population. oncogenic transformation is a biological effectiveness of radon progeny alpha particle hits. the biological effects which has caused by exposure to radon, were the main result of a complex series of physical, chemical, biological and physiological interaction...

abstract mercury compounds are widely used in several industries. such compounds can find their way to the environment causing its pollution. mercury is considered as a powerful carcinogenic agent. on the other side, the garlic extract is characterized by having compounds of specific anticarcinogenic action. therefore, the present study was conducted to investigate both the genotoxicity and cyt...