Search found 7428 matches

by Zamfir
Sun Sep 14, 2008 2:04 pm UTC
Forum: Serious Business
Topic: Long term political character assasination
Replies: 8
Views: 1604

Re: Long term political character assasination

Yeah, true democrats should vote for McCain and let him take the brunt.
by Zamfir
Sun Sep 14, 2008 1:17 pm UTC
Forum: Mathematics
Topic: Lowest number with some number of factors
Replies: 11
Views: 3557

Re: Lowest number with some number of factors

I was recently puzzling with the same question. My approach at the moment: start off with g_0=1 , with f_0=1 factors. Multiply this with the prime number that gives you extra factors at the lowest 'cost' in increased g , that is: c^1=\frac{g_1 - g_0}{f_1 - f_0} should be as low as possible. In the f...
by Zamfir
Sun Sep 14, 2008 12:14 pm UTC
Forum: Science
Topic: Hackable Implants?
Replies: 18
Views: 2306

Re: Hackable Implants?

I'd love to see future murder mysteries where the victim micht have been killed by a hacked pacemaker: Poirot: This suggest the killer was an electrical engineer... That narrows down the possibilities. Hastings: Yes, I think we can rule out that a woman did it. Poirot: Not so fast, mon ami. Les femm...
by Zamfir
Thu Sep 11, 2008 8:37 am UTC
Forum: Science
Topic: Future of humanity
Replies: 4
Views: 1023

Re: Future of humanity

You die. I die. We all die. Perhaps there wil be new people. They will die.
by Zamfir
Sat Sep 06, 2008 4:37 pm UTC
Forum: Science
Topic: Help Looking For Study
Replies: 4
Views: 1219

Re: Help Looking For Study

I think that's much too broad, there muct be thousands of them... Have you tried Google Scholar?

On another note, Crookedtimber.org is a blog where at least some of the posters are academics specialized in online sociological stuff. You could look in their archives for interesting stuff.
by Zamfir
Sat Sep 06, 2008 4:27 pm UTC
Forum: Mathematics
Topic: A remarkable fact (the finiteness of pi)
Replies: 19
Views: 2983

Re: A remarkable fact (the finiteness of pi)

Martian, that's roughly what I figured. But the fact that a symmetric shape can have a fixed CG even when it extends to infinity suggests that there might be other, unsymmetric shapes too, as long as there is infinite mass on both sides. I was thinking something along the lines of \frac{1}{x} , but ...
by Zamfir
Sat Sep 06, 2008 4:12 pm UTC
Forum: Mathematics
Topic: A remarkable fact (the finiteness of pi)
Replies: 19
Views: 2983

Re: A remarkable fact (the finiteness of pi)

Nathaniel, if you look at a finite part of the object, from 1 to a, then the centre of mass lies at (1+ ln(a)) , give or take some constants, so for a long but finite horn, the centre of mass would lie actually much closer to the thick end then to thin end, as ln(a) goes to i...
by Zamfir
Sat Sep 06, 2008 11:48 am UTC
Forum: Coding
Topic: Project Euler
Replies: 411
Views: 158359

Re: Project Euler

I've seen a few of those J entries in project Euler, but there seems to be absolutely no point to the language except for making one-liners for Project Euler. Am I missing something, or those PE entries not representative?
by Zamfir
Sat Sep 06, 2008 11:02 am UTC
Forum: Mathematics
Topic: A remarkable fact (the finiteness of pi)
Replies: 19
Views: 2983

Re: A remarkable fact (the finiteness of pi)

Martian invader, your right about the center of mass. If you make a horn from 1 to a, a goes to infinity, then the moment-of-inertia is proportianol to ln(a), while the volume stays bounded, something like \pi-1/a . So if you divide them, the centre of 'mass' (volume really) goes to infinity if a do...
by Zamfir
Wed Sep 03, 2008 3:17 pm UTC
Forum: Science
Topic: Invisibilty "Cloaks"
Replies: 14
Views: 1662

Re: Invisibilty "Cloaks"

It's good to have a real expert. What is it that you want to use these materials for ? Or are they at the moment just 'exercises' to learn how to manipulate light?
by Zamfir
Wed Sep 03, 2008 11:15 am UTC
Forum: Science
Topic: Recommended reading for science newbie, please?
Replies: 29
Views: 3845

Re: Recommended reading for science newbie, please?

A bit of meta-advice, which other people might not all agree on. I would start by books written by journalists or other relatively amateurs (if they have good reviews), and stay away from popular books written by scientists, especially new and hypey ones. Scientists have the tendency to focus on new...
by Zamfir
Wed Sep 03, 2008 10:05 am UTC
Forum: Science
Topic: Invisibilty "Cloaks"
Replies: 14
Views: 1662

Re: Invisibilty "Cloaks"

Perhaps I am mistaken here, but it was my impression that no-one is planning to use these 'materials' for invisibility, they just use this rather theoretical possibility to get media attention. Which is not per se a bad thing. The real application seem to lie in advanced optics, like sensors, but al...
by Zamfir
Wed Sep 03, 2008 9:36 am UTC
Forum: Science
Topic: Weather Control?
Replies: 6
Views: 1102

Re: Weather Control?

Build a house. That's not entirely a joke. It shows that if you have enough power and materials comapred to the amount of air, you can control the weather good enough without worrying about chaos. On the other hand, we already spend something like 15 or 20% of the economy on construction, and a simi...
by Zamfir
Tue Sep 02, 2008 12:27 pm UTC
Forum: Serious Business
Topic: Two Votes?
Replies: 52
Views: 5615

Re: Two Votes?

The way it seems to me, the problem here is not the voting system, but the winner-takes-all system with the focus on actual persons ( be it the president, senator or whatever). In such a system, large parties will always be dominant, no matter how you change the system. Here in the Netherlands, as i...
by Zamfir
Sat Aug 30, 2008 8:11 am UTC
Forum: Science
Topic: Drag equation
Replies: 4
Views: 1137

Re: Drag equasion

I don't think there exists a closed-form equation for your problem. This is usually one of the first problems in classes on the numerical (i.e. with computers) solution of differential equations. If you are unfamiliar with numerical integration, it's rather easy for this example. If you just know ho...
by Zamfir
Fri Aug 29, 2008 4:42 pm UTC
Forum: Science
Topic: 21 Hockey Pucks
Replies: 7
Views: 1720

Re: 21 Hockey Pucks

Velifer, normal people line them up in seven rows of three.
by Zamfir
Fri Aug 29, 2008 4:39 pm UTC
Forum: Serious Business
Topic: Nationalism
Replies: 28
Views: 4838

Re: Nationalism

But what if one syndicate where to decide to loot some other, smaller syndicate, with the goal to distribute the loot fairly amongst its members? More in general what is the difference between a single collective looking out for its own interests, and a nation state? If I understand your idea, your ...
by Zamfir
Fri Aug 29, 2008 9:42 am UTC
Forum: News & Articles
Topic: Russia Supports Ossetian, Abkhaz Independence
Replies: 19
Views: 1918

Re: Russia Supports Ossetian, Abkhaz Independence

Lumpy, I think you're right. The number of wounded in South Oseetia never rose to more than 150 or 200, and that makes 60 death much more realistic than 1500.

Usually, the number of wounded is much more realistic, as it is hard to fake 1000's of wounded people in a hospital
by Zamfir
Fri Aug 29, 2008 9:08 am UTC
Forum: Science
Topic: What the heck is that?
Replies: 19
Views: 2868

Re: What the heck is that?

The copyright of the foto is DigitalGlobe, and their (active) satellite would be QuickBird http://www.digitalglobe.com/index.php/85/QuickBird . EDIT: I rechecked the image, and this time I got a different copyright message, from 'TerraMetrics' That means it's from the Landsat 7 satellite landsat has...
by Zamfir
Fri Aug 29, 2008 8:31 am UTC
Forum: Science
Topic: Simulated Sonic Boom?
Replies: 12
Views: 2029

Re: Simulated Sonic Boom?

Anpheus, your stroy is true in the sense that hitting water at high speeds is different then at low speeds, but it has nothing to do with some special property of water that is different for fast impacts. ( there are actually materials that do behave different for different impacts) It's just that f...
by Zamfir
Thu Aug 28, 2008 5:30 pm UTC
Forum: Serious Business
Topic: Nationalism
Replies: 28
Views: 4838

Re: Nationalism

A_A, I am not that sure about the details of the early USA, but are those people's militias not exactly the internal groups needed? It is not that hard to imagine how a particularly large and unified community would start to use its militia to bother its neighbours.
by Zamfir
Thu Aug 28, 2008 3:34 pm UTC
Forum: Serious Business
Topic: Nationalism
Replies: 28
Views: 4838

Re: Nationalism

Nationalism is not the same as centralism, far from it. It is more the idea that a state should coincide with a nation, where a nation is 'a people', a group that differs from others nations in ethnicity, language and culture, and of course often combined with the idea that someones nation is better...
by Zamfir
Thu Aug 28, 2008 12:44 pm UTC
Forum: Science
Topic: Canned laughter
Replies: 13
Views: 2782

Re: Canned laughter

Also, do not underestimate the effect of canned laughter, even if it irritates you! Even if you are fully aware that it is artificial, it still makes it easier for you to find things funny, and especially to laugh yourself. Try watching a silent comedy ( Mr Bean) without the sound, and then with sou...
by Zamfir
Thu Aug 28, 2008 12:36 pm UTC
Forum: Science
Topic: Favorite Perpetual Motion Machines
Replies: 105
Views: 12501

Re: Favorite Propetual Motion Machines

Skeptic, you are right, I already posted a correction a few posts above. I was mistaken in thinking that you guys were talking about the 'shadow effect', where light from F1 directly away from F2 will hit F1 after reflection.
by Zamfir
Thu Aug 28, 2008 12:12 pm UTC
Forum: Science
Topic: Simulated Sonic Boom?
Replies: 12
Views: 2029

Re: Simulated Sonic Boom?

i know that a sonic boom occurs when an object, lets say an airplane, moves fast enough to produce a wall of air in front of it made of the repeated constructive interference of its own sound waves, then proceeds to move faster than sound through that wall of compressed air. is that all right? I've...
by Zamfir
Thu Aug 28, 2008 9:32 am UTC
Forum: Science
Topic: Favorite Perpetual Motion Machines
Replies: 105
Views: 12501

Re: Favorite Propetual Motion Machines

seraph, I completely misunderstood a critical part of your explanation, which is why I thought it wouldn't work. For others who might miss the same thing, I'll write it down. The lines of the light coming from the objects do not pass through the centers of the objects (foci of the ellipses)....
by Zamfir
Wed Aug 27, 2008 6:37 pm UTC
Forum: Science
Topic: Favorite Perpetual Motion Machines
Replies: 105
Views: 12501

Re: Favorite Propetual Motion Machines

Seraph and skeptic, are you guys sure the 'magnification' theory for the mirror problem is correct? As I see it, your explanaton is a mechanism how not fully 100% of the radiation from F1 ends up in F2, but instead 100%-x . But I would say x would be proportional to the diameter of the objects, and ...
by Zamfir
Wed Aug 27, 2008 3:36 pm UTC
Forum: News & Articles
Topic: Russia Supports Ossetian, Abkhaz Independence
Replies: 19
Views: 1918

Re: Russia Supports Ossetian, Abkhaz Independence

I think the story is little bit more complicated then "at least he's our son of a bitch" cynicism. Even if this is only about spheres of influence, European history suggests that being in the American sphere is a whole lot better then in the Russian sphere. Most pople in the former Eastern...

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