Abstract: This paper presents a novel single-phase PWM ac-ac converters that can solve commutation problem in single-phase direct ac-ac converter without sensing input voltage polarity. By using the ...

Long before air conditioners, heat pumps, or even electricity, people were forced to survive extreme climates using nothing but clever architecture—and many of those ancient ideas worked better than ...

But as much as I liked Johnny Rotten — hiding below this bald pate lies the heart a proto-punker — I really do prefer modernity, at least as it applies to automobiles. For one thing, I loved the ...

Christian Pulisic and Alexis Saelemaekers did not train for AC Milan this afternoon, so are in some doubt for Saturday’s meeting with Lazio. The USMNT star had only just returned to the starting XI ...