ParaGard is the only brand currently manufacturing copper IUDs. They are plastic T-shaped devices about the size of a quarter. Unlike hormonal IUDs, ParaGard is wrapped with a coil of copper ...

But when he shows the ends of the core, you’ll see that the side that attracts aluminum has a copper ring embedded in it. The coil is fed with AC. The magnetic field from the coil induces an ...

Step 4: Rinse the AC coils with water (optional). As AC coils are typically made from copper or aluminum, they can be cleaned ...

The implications of WPT systems for AM radio will be explored in the Broadcast Engineering and IT Conference at the NAB Show.