What Makes a Good PV Technology?

Comparing maximum efficiency is a good place to start, but it takes more than that for a commercial breakthrough

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Screenshot of the Interactive: Record-Breaking PV Cells
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Video Friday: DARPA Subterranean Challenge Final

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DARPA

This week we have a special DARPA SubT edition of Video Friday, both because the SubT Final is happening this week and is amazing, and also because (if I'm being honest) the SubT Final is happening this week and is amazing and I've spent all week covering it mostly in a cave with zero access to Internet. Win-win, right? So today, videos to watch are DARPA's recaps of the preliminary competition days, plus (depending on when you're tuning in) a livestream of the prize round highlights, the awards ceremony, and the SubT Summit with roundtable discussions featuring both the Virtual and Systems track teams.

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Making 3D-Printed Objects Feel

3D-printing technique lets objects sense forces applied onto them for new interactive applications

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Researchers from MIT have developed a method to integrate sensing capabilities into 3D printable structures comprised of repetitive cells, which enables designers to rapidly prototype interactive input devices.

MIT

Some varieties of 3D-printed objects can now “feel," using a new technique that builds sensors directly into their materials. This research could lead to novel interactive devices such as intelligent furniture, a new study finds.

The new technique 3D-prints objects made from metamaterials—substances made of grids of repeating cells. When force is applied to a flexible metamaterial, some of their cells may stretch or compress. Electrodes incorporated within these structures can detect the magnitude and direction of these changes in shape, as well as rotation and acceleration.

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Safety in the Spotlight: Hendrix Covered Conductors

Safety-related contact currents for humans touching tedium voltage covered conductors

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Hendrix Aerial Cable Systems

This white paper explores what happens when humans come into physical contact with medium voltage covered conductors under a range of conditions. Safety thresholds, lab tests of charging currents, and CEATI testing of covered conductors are discussed. Authored by experts at Hendrix Aerial Cable Systems.

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