Three people were killed when a medical evacuation helicopter crashed on Tucson's north side Wednesday afternoon. Killed in the crash were the pilot, flight nurse and paramedic, said Air Methods, the ...

The history of the Jaguar logo design isn't a clean story—it's a chaotic 100-year case study in brand survival. We're doing a deep dive into the Leaper, the Growler, the 2012 "liquid metal" fiasco, ...

Abstract: The rich information in the power spectral density (PSD) matrix of a received signal can be extracted in different ways for various purposes in signal processing. Care, however, must be ...

The Physical Sciences Directorate (PSD) delivers scientific discoveries and technical breakthroughs that will help realize solutions in energy and national security and provide economic benefit to the ...