Bulgaria was on the frontier of the Roman Empire, part of the 1,800km-long Danube Limes of forts and fortified cities.

This paper presents a universal tuning system for harmonic operation of series-resonant inverters (SRI), based on a self-oscillating switching method. In the new tuning system, SRI can instantly ...

To supply the cathode voltage for the two gyrotrons (140 GHz/1 MW/3 s) of the electron cyclotron resonant heating system on HL-2A, a high-voltage power supply (HVPS) based on pulse step modulator (PSM ...

A common whiff in the Roman city would have come from the animals and the waste they created. Roman bakeries frequently used ...