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At 20 airports in the United States, security screening is handled not by the Transportation Security Administration, but by private companies — and their checkpoints aren’t seeing long lines.

Every so often, we receive an email that stops us cold. Not because it is dramatic. Not because it is careless. Because it feels impossible. Sheri M. from Georgia recently wrote to us with this ...

Abstract: Tackling the challenge of open-switch (OS) fault diagnostics in grid-tied three-level neutral point clamped (NPC) inverters with parameter uncertainty, this paper introduces a fault ...