"It's almost unfathomable to imagine what is happening to this planet. The planet's atmosphere simply cannot withstand the ...

From the discovery of gravity to the first mission to defend Earth from an asteroid, here are the most important physics ...

Objectives To reduce occupational radiation exposure in a hybrid operating room (OR) used for three-dimensional (3D) image guided spine procedures. The effects of staff positioning, different X-ray ...

Multilayer graphene-gated carbon nanotube (CNT) emitters are introduced to novel vacuum-sealed x-ray tubes. We characterized field emission performances and electron-beam (Ebeam) converging of the ...