studies in cognitive linguistics have highlighted the importance of metaphors for language teaching. metaphoric competence, as an important aspect of intelligence, can contribute to the learning of languages. most textbooks in esl/efl avoid the issue of figurative language and concentrate only on the denotative aspects of language. this article reports a study conducted at the islamic azad univ...

Abstract The serrodyne principle enables an electromagnetic signal to be frequency shifted by applying a linear phase ramp in the time domain. This phenomenon has been exploited shift signals radiofrequency, microwave and optical regions of spectrum over ranges up few gigahertz, for example, analyse Doppler radiofrequency noise suppression stabilization. Here we employ this centre high-power fe...