SPATIAL DATA UNCERTAINTY IN A WEBGIS TOOL SUPPORTING SEDIMENTS MANAGEMENT IN WALLONIA


Gain of a Smith-Purcell free-electron laser

A formula is derived for the small-signal gain of a Smith-Purcell free-electron laser.The theory describes the electron beam as a moving plasma dielectric, and assumes that the electron beam interacts with an evanescent mode traveling along the surface of a periodic waveguide with a rectangular profile.The phase velocity of the evanescent wave is s

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From the editors

From the Editors RESEARCH ON click here NEW METHODS FOR TESTING LANGUAGE SKILLS: A FOCUS ON SPEAKING PERFORMANCE The current issue has speaking performance as a conducting thread, specifically, the research undertaken on new methods to test it.Testing language skills and defining the constructs under which tests need to be constructed is a complex

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