What happens if I hang a neutral object from the string and bring the positively charged PVC pipe? These moving electrons experience an attractive force from the positive charges on the PVC and thus move to the right side of the metal (as seen in the diagram).
It has installed a system at the Oakland Airport in California, not for passengers, but to screen employees as they come to work on the sensitive “air side” of operations, or as they move backward and forward several times a day from "land side." Evolv’s millimeter-wave scanners look like bulked-up versions of the beepy theft-prevention gates near the doors of some stores, and they can grab an image in a fraction of a second, as opposed to a more typical two seconds.
Instead, he calls on his army of sonic robots—a collection of small, motorized creations that click, clank, and whirr in an intricate mechanical symphony.Geist composes robotic electronic music, a burgeoning genre of electro jams that relies on hardware, not software, to engineer electronic sounds and beats.
HP's New 3-D Printers Build Items Not of Plastic but of SteelHP is hoping its new Metal Jet 3-D printers will provide inroads into manufacturing sectors such as automobiles and medical devices.HPWhen you think about 3-D printing, chances are you think of little plastic doodads created by desktop devices like those made by MakerBot. Computing and printer giant HP wants you to think about metal.Today the company announced the Metal Jet printer, an industrial-scale 3-D printer that builds items not of plastic but of steel.3-D plastic printing is widely used for custom items such as prosthetics and hearing aids, and by product designers for prototyping.