## Search found 22 matches

Sat Apr 26, 2014 12:53 am UTC
Forum: Science
Topic: Frequency of a hydrogen laser?
Replies: 5
Views: 1511

### Re: Frequency of a hydrogen laser?

What do you need your laser to do in the context of your story? The short version: Exist. I'm aiming for a a reasonably hard-Sf setting, in which dragging even a single 50-megawatt reactor across the Solar system is a feat requiring near-heroic measures. Saturn has a built-in energy source, in the ...
Fri Apr 25, 2014 6:30 pm UTC
Forum: Science
Topic: Frequency of a hydrogen laser?
Replies: 5
Views: 1511

### Re: Frequency of a hydrogen laser?

Not all electronic transitions are capable of lasing. Some (if not most, or all - my laser physics is a little rusty) lasing transitions are from one (excited) state to a lower, non-ground, state. So, for example, in an N2 laser, the molecules are "pumped" to an excited state, n>>1, then ...
Thu Apr 24, 2014 1:57 am UTC
Forum: Science
Topic: Frequency of a hydrogen laser?
Replies: 5
Views: 1511

### Frequency of a hydrogen laser?

What frequency would a laser that used hydrogen as the lasing medium produce? There have been proposals to use various planet's ionospheres as lasing mediums (such as 'Engineering Planetary Lasers for Interstellar Communication', at http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880014441.pd...
Sun Feb 23, 2014 6:00 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

Quantum mechanics doesn't add anything to this problem, so let's all just ignore that and focus on the math. Here is the problem boiled down: 1. There is a deadline coming in [1,2,3...10] years, with equal probability. 2. To win you must have a certain amount of money by the deadline. The amount re...
Sat Feb 22, 2014 6:15 am UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

All any of that means is that your utility isn't linear. If it means surviving where you otherwise wouldn't, then winning half a million dollars might be worth more to you than 500,000 times the worth of one dollar to you. There's nothing especially quantum about that. If you need to come up with \$...
Sat Feb 22, 2014 12:21 am UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

Finally, you aren't providing any details or constraints; this isn't really a mathematics (, or quantum physics) question, it's a question about what someone should do with their money. That's a fair enough point. One part of the discussion I'm hoping to have involves comparing the various types of...
Fri Feb 21, 2014 11:49 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

Whatever metaphysical significance you might place on quantum versus classical randomness, I'm not sure how any of it changes the details of your original question. You still just want to maximize your expected return, and we still can't say which method is a better way of doing that without more d...
Fri Feb 21, 2014 10:13 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

I think there's problems with trying to deal with probabilities in many worlds, because everything (that can happen) happens with certainty. I think there's also some concerns with possible infinities of worlds where trying to think about the proportion of worlds with feature x is gonna spit out 0%...
Fri Feb 21, 2014 6:40 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

MWI has to do with quantum things, though. If you flip a coin, classically modeled, you have a 50% chance of H or T, but that doesn't entail anything about the outcomes of an actual physical coin flip* - especially if you are factoring in atoms in your brain. I guess I just don't see the quantum li...
Fri Feb 21, 2014 5:59 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### Re: A Multiple-Worlds Lottery

I don't think I fully understand what it is your discussing; I don't see the link to many worlds and QM, nor do I understand what exactly is being discussed in terms of resources (you say resources are abstracted as money, but seem to be discussing actual money). Are you, essentially, asking what t...
Fri Feb 21, 2014 5:23 pm UTC
Forum: Mathematics
Topic: A Multiple-Worlds Lottery
Replies: 17
Views: 3861

### A Multiple-Worlds Lottery

Elsewhere, I've been having a conversation about the Multiple Worlds Interpretation of quantum mechanics, and what it would take to maximize the number of future timelines in which a person continues to live. To have something resembling a concrete model to discuss, I've ended up putting together so...
Tue Nov 20, 2012 11:32 am UTC
Forum: General
Topic: If you could take it with you, what would you take?
Replies: 15
Views: 2887

### Re: If you could take it with you, what would you take?

I don't see the point in storing digital data on some long lasting DVD. What are the odds you can even read them out in a century? Even if DVD technology still exists then, why would any of our current data formats still be in used or documented then? I think there's a very real chance your shiny d...
Mon Nov 19, 2012 7:49 pm UTC
Forum: General
Topic: If you could take it with you, what would you take?
Replies: 15
Views: 2887

### Re: If you could take it with you, what would you take?

I would take a jacket. I'd probably be really cold when I woke up. Also an umbrella; it would double as shade and rain-protection, as long as it was UV-blocking and long-lasting. I'd have assumed you'd be frozen clothed, though I realize that has it's share of issues. Some practical clothing option...
Sun Nov 18, 2012 12:57 pm UTC
Forum: General
Topic: If you could take it with you, what would you take?
Replies: 15
Views: 2887

### Re: If you could take it with you, what would you take?

Well, my immediate reaction on reading the title was to choose some sort of weapon. Without knowing roughly how long the cryogenic suspension will last, or whether the personal storage will be environmentally controlled though, it's difficult to say whether ammunition for a pistol or other firearm ...
Sun Nov 18, 2012 12:23 am UTC
Forum: General
Topic: If you could take it with you, what would you take?
Replies: 15
Views: 2887

### If you could take it with you, what would you take?

The Scenario: Our protagonist estimates that present-day cryonics has around a five percent chance of leading to a successful revival. Since that's better than the zero percent chance if he doesn't sign up, and he can afford it, he makes the necessary arrangements. As part of those arrangements, he ...
Wed Feb 29, 2012 6:58 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1023: "Late-Night BS"
Replies: 73
Views: 19600

### Re: 1023: "Late-Night PBS"

"Does anyone remember this kid’s show? It was called Candle Cove and I must have been 6 or 7. I never found reference to it anywhere so I think it was on a local station around 1971 or 1972. I lived in Ironton at the time. I don’t remember which station, but I do remember it was on at a weird ...
Wed Feb 29, 2012 5:35 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1023: "Late-Night BS"
Replies: 73
Views: 19600

### Re: 1023: "Late-Night PBS"

"Does anyone remember this kid’s show? It was called Candle Cove and I must have been 6 or 7. I never found reference to it anywhere so I think it was on a local station around 1971 or 1972. I lived in Ironton at the time. I don’t remember which station, but I do remember it was on at a weird ...
Wed Feb 29, 2012 5:18 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1023: "Late-Night BS"
Replies: 73
Views: 19600

### Re: 1023: "Late-Night PBS"

"Does anyone remember this kid’s show? It was called Candle Cove and I must have been 6 or 7. I never found reference to it anywhere so I think it was on a local station around 1971 or 1972. I lived in Ironton at the time. I don’t remember which station, but I do remember it was on at a weird t...
Sat Jan 30, 2010 12:21 am UTC
Forum: Comics/Graphic Novels
Topic: Comics you Remember Reading but Can't Remember the Name of.
Replies: 4
Views: 13066

### Which webcomic? "I am a good robot"

Today's xkcd has reminded me of a couple of sideplots from one of the webcomics I've read, which center around the quote "I am a good robot". One involved a pair of planetary-exploration robots, one of which is about to be destroyed and (spoiler) ends up being 'caught' by the other... anot...
Fri Jan 29, 2010 5:19 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0695: "Spirit"
Replies: 337
Views: 219522

### Re: "Spirit" Discussion

Freefall had a couple of sidestories that are very similar, though I'm having trouble finding the exact strips (if you know the ones I mean, feel free to mention them)... and have a perspective that I much prefer to think of when anthropomorphizing machinery:

"I am a good robot."
Mon Aug 20, 2007 7:31 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0305: "Rule 34"
Replies: 196
Views: 113113
pwill wrote:
Gadren wrote:Hmm... I wonder if there's any female blacksmith porn?

I dunno, but I do know where I could get some.

You say that, but then neglect to provide a link to wherever that may be?
Wed Jul 18, 2007 7:53 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0291: "Dignified"
Replies: 120
Views: 31537
I just registered, so that I could be the first to post that I was shoved /feet/first, thankyouverymuch. And as far as I know, I only try to act dignified around the woman who was originally involved in the matter. As far as I know, she only uses the Net to research genealogy. But if, in the distant...

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