[jacquesm]

Grr. I can't access that paper but thank you for digging that up. If Animats' calculations above are accurate though then uBeam is at a very small fraction of that 53%.

Is there anything in that paper that could explain the difference?

[tzs]

If you make a free account at deepdyve.com, you can read a free online preview of the paper for 5 minutes. The paper is only six pages long so that might be enough time to find an answer the question. (Or enough time to take six screenshots...).

I don't know any more because that was how I found that and skimmed the paper about three years ago, for a prior discussion of uBeam here on HN.

[m00n]

Not sure, if linking to the pdf is frowned upon here: sci-hub.cc and paste the paper name, voilá.

[jacquesm]

Thank you!