If you’re planning on hosting large gatherings during the next few months, you’ll want to invest in a powerful vacuum that can tackle big messes without being a pain to use. If you’re on the market ...

Abstract: In this letter, we demonstrate a PDMS/GaN-based optical microsensor for measuring vacuum pressure. The submillimeter-sized GaN device responsible for optical emission and detection is ...

Marked: "DAYRAD Tube Checker / Mfd. by the Radio Products Co., Dayton, Ohio. / Licensed Under Weston Patent 1704566 Type B". Includes leather carrying strap. Tube tester designed for A.C. plug in ...

There’s no such thing as a complete vacuum. Even in the cosmic void between galaxies, there’s an estimated density of about one hydrogen or helium atom per cubic meter. But these estimates are largely ...

Abstract: In order to solve the phenomenon of heavy passenger flow in the metro station during the peak commuting period, the metro operating company tries to improve the metro capacity by shortening ...

Wash your hands before and after taking care of your surgical drains to prevent infection. The color of the drainage should change from bright red to straw color after a few days. It is normal to have ...