Search found 8 matches

by GreenTom
Wed Feb 10, 2016 9:39 pm UTC
Forum: What If?
Topic: What-If 0145: "Fire From Moonlight"
Replies: 157
Views: 81291

Re: What-If 0145: "Fire From Moonlight"

The sun-moon-lens-paper system isn't a closed one (in the classical sense), as there's a frikin' star-sized fusion reactor acting as an external power supply To more clearly understand why, take note of the fact that there is light flying around everywhere in the room at all times, bulb or not, mos...
by GreenTom
Wed Jan 20, 2016 9:41 pm UTC
Forum: What If?
Topic: What-If 0141: "Sunbeam"
Replies: 81
Views: 47748

Re: What-If 0141: "Sunbeam"

I believe that randell forget the vacuum non-linearity that might save the earth. When considering such high powers (10^23 KW) the vacuum itself has non-linearity parameter which will collapse the laser beam into a filament which will radiate in all directions and by the time the beam reaches the e...
by GreenTom
Wed Feb 25, 2015 4:43 pm UTC
Forum: What If?
Topic: What-If 0130: "Snow Removal"
Replies: 51
Views: 22170

Re: What-If 0130: "Snow Removal"

He's unfortunately got the power output of a carrier nuclear reactor wrong. The A4W plant on a carrier produces 550 megawatts of power, and each carrier has two. So to provide the energy for the snow-melter contraption, he would only need one carrier, and only slightly over one of those reactors (s...
by GreenTom
Wed May 14, 2014 1:58 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1368: "One Of The"
Replies: 91
Views: 22171

Re: 1368: "One Of The"

This always seemed to me to be a nod to rigor: never make a factual statement that you can't source.
by GreenTom
Tue Dec 03, 2013 8:55 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 75046

Re: What-If 0073: "Lethal Neutrinos"

Anyone else remember "Anvil of Stars." Only SF book I can think of where lethal neutrinos were used, and I think roughly correctly. Test at (spoiler)
by GreenTom
Fri Sep 23, 2011 3:52 pm UTC
Forum: Science
Topic: Well, this could change things (neutrinos)
Replies: 289
Views: 45845

Re: Well, this could change things

IANAS, but a few things from the paper stood out... -- a previous poster wondered about cosmic rays. The first paragraph of section 5 mentions this. My reading is that a random cosmic ray would, on average, cause a flight time that's 10us 5us too fast, and that about one in 10^4 events will be a cos...
by GreenTom
Wed Aug 03, 2011 12:32 am UTC
Forum: Science
Topic: Teller-Ulam fusion generator
Replies: 25
Views: 3476

Re: Teller-Ulam fusion generator

You might be interested in Project Gnome, a 1961 attempt to generate power by using atomic weapons to produce steam. A casual google on this doesn't reveal much about if it worked and why the concept was abandoned. I s...
by GreenTom
Wed Aug 03, 2011 12:19 am UTC
Forum: Science
Topic: Are these recognized visual phenomena?
Replies: 12
Views: 6784

Re: Are these recognized visual phenomena?

I see something similar to your second phenomenon when I close my eyes and apply some pressure. I think they're either phosphenes ( or the third type of closed-eye hallucination ( /a) listed. I see radially symmetric, fast ...

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