Although dinosaurs lived many millions of years ago, we know that they existed because some of them turned into fossils when they died. Watch our animation to discover how this happened, and explore ...
Abstract: Ultraviolet light-emitting diodes (UV-LEDs) have important application value in fields such as early sterilization and disinfection, biochemical testing, medical health, and covert ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results