Crazy (?) theoretical / technical ideas

Posted: 4/8/2016 11:02:49 PM
oldtemecula

From: 60 Miles North of San Diego, CA

Joined: 10/1/2014

emarii, you have great imagination, it would be simpler and cheaper to have the DJ's sidekick do the effects in real time to match the mood of the room.

In drought stricken So. California we have to explain to our grandchildren what is going on in this video.

Posted: 2/17/2017 3:42:05 PM
dewster

From: Northern NJ, USA

Joined: 2/17/2012

Very interesting paper on wireless power transfer:

https://s3-us-west-1.amazonaws.com/disneyresearch/wp-content/uploads/20170215220933/Quasistatic-Cavity-Resonance-for-Ubiquitous-Wireless-Power-Transfer-Paper.pdf

I tend to ignore this kind of stuff, but this is technically quite fascinating.  Basically they make a room electrically resonant at ~1.3MHz via conductive walls and a split conductive center column bridged by a physical capacitor.  Then they flood the room with RF which creates a magnetic standing wave, and the electric field gets confined to the capacitors in the split.

So effectively any coil in the room is a tightly coupled element in an enormous transformer, and the energy doesn't fall off as the square of the distance like it normally does.  They tune the room with the capacitor in the split, but I wonder if / how they tune the receivers?

Found it on Hacker News this morning:

https://news.ycombinator.com/item?id=13663193

https://www.disneyresearch.com/publication/quasistatic-cavity-resonance-for-ubiquitous-wireless-power-transfer/

Video for the tl;dr crowd:

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