The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

Gold, a precious metal, mostly appears in alloys and only rarely in its pure form. Because of its physical properties, it is resistant to air, moisture, heat and many solvents. Gold also has a high ...

Abstract: A novel planar slow wave structure (SWS) for traveling wave tube (TWT) is proposed. The major advantage of the planar architecture is its easy realization with respect to the typical 3-D ...