Abstract: The backward wave oscillator (BWO) is an important vacuum electron source that utilizes backward waves to interact with electron beam, resulting in high-frequency self-excited oscillations.

Most people do not need to wash their hair every day. Straight, thin hair may need more frequent washing than curly hair. Teens and young adults usually produce more oil (sebum) and may need to wash ...

Saturday’s Panthers-Buccaneers game included a bizarre sequence in which a backward pass hit the ground, was picked up by Carolina running back Rico Dowdle, and was blown dead. Initially, referee Brad ...

The winter elements can be a mess on your car's paint, especially in the chillier parts of the U.S. Salt on the roads is great at melting ice but harmful to your car's paint and underbody. So how ...

Thursday night’s instant classic between the Seahawks and Rams included an unprecedented two-point conversion that replay review changed from an incomplete pass into a backward pass that was recovered ...

Backward skating can be intimidating, but with the right steps, anyone can master it! This comprehensive tutorial shows you how to position your feet, maintain balance, and glide backward effortlessly ...

Here’s what you’ll learn when you read this story: The Earth’s magnetosphere protects life from deadly space radiation, but many aspects of its function remain a mystery. Scientists have long believed ...

Walking backward could have meaningful benefits for joint health, chronic pain and even brain health, and there's scientific evidence to back it up. Multiple studies show that simply changing ...

Here’s a simple way to switch up your walking routine, according to experts: try going backward. Taking a brisk walk is an exercise rich in simplicity, and it can have impressive mental and physical ...

Flu season has hit Central Florida. Here’s what you need to know. Trump administration halts use of human fetal tissue in NIH-funded research Bill to lower prescription drug prices clears first hurdle ...