background & aim: eucalyptus l'her. [an aromatic genera of the family (myrtaceae)] is native to australia and other tropical species is planted worldwide. the purpose of this study is to extract and identify the essential oils components of four species of eucalyptus l'her. cultivated in botanical garden of kashan, central iran. experimental: leaves of e. largiflorens, e. intertexta, ...

Oil is a major source of income for Ecuador and since the 1970s has been the " engine " of the nation's economy. Before the 1970s oil price boom, Ecuador was one of the poorest countries in Latin America. Since then, oil production has been the primary cause of Ecuador's economic growth, which has averaged 7% annually. Per capita income rose from US$ 290 in 1972 to US$ 1 200 in 2000. Today, oil...

Abstract In this paper, the mechanical model of sheath has been established according to engineering practice and analysed in two aspects: temperature acts alone pressure act together. The results demonstrate that it is unnecessary worry negative influence individual action. Temperature can cause many adverse characteristics on cementing: thermal stress material properties. coefficient ? coming...