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Tuesday, March 27

Blog

BBCodarama

One of the features I've built in to Minx is BBCode support.  You can use this in both posts and comments.  At least, you should be able to use it in comments.  We'll soon see.


more...

Posted by: Pixy Misa at 10:07 PM | Comments (3) | Add Comment | Trackbacks (Suck)
Post contains 117 words, total size 5 kb.

Monday, March 26

Geek

How Much For Just The Planet?

Bugger.

I knew that Niven-style Ringworlds required materials with impossible tensile strengths (beyond anything known by quite a few orders of magnitude), but I wasn't sure about Banks-style orbitals.  Orbitals, as well as being much smaller, have the attraction that they are in orbit about their sun and don't exhibit the dynamic instability of ringworlds.

So how big can we build an orbital? The answer is, not very.

Micro-scale samples of carbon nanotubes have apparently been tested with a tensile strength of 62GPa.  That means they can withstand a tensile force of 62GN/m2* before breaking.

The density of said carbon nanotubes is 1.34g/cm3.  Assuming we want an acceleration of 1G - let's round it up to 10m/s2 for simplicity - this gives us a maximum circumference of 62GPa / 13.4kN/m3 = 4600km.**

The theoretical maximum tensile strength for carbon nanotubes is 300GPa, which would give us 23,000km.  But I'd want to have a safety factor of 5, which would eat that gain, or reduce our circumference to about 900km for current materials.

That last figure also means that you couldn't rely on gravity to hold your atmosphere in; for any reasonable atomosphere retention you'd need walls rising pretty much the radius of the structure.  So it would have to be a sealed environment.

An orbital that size*** with a population density of, say, The Netherlands, would support 18 million people.  Its mass is kind of arbitrary, but if we make it 100m thick, we get about 6 trillion tons.  The asteroid 10 Hygiea† would provide enough materials to build 10,000 of these, giving us room for 180 billion people.****

Just in case you were looking for an investment property...

* Hey, I have super/subscript in the comments editor, but not in the post editor.  I really need to fix that!
** I think I got the units right there.  I'm pretty sure I at least got the scalar quantities right.
*** Let's give it a width of 50km for the sake of getting a number here.
****  If we had theoretical-limit materials and scaled everything up linearly - including the thickness - we'd get 80 habitats capable of holding 450 million people each.

† A test of my new Wikipedia linky tags, [wp] and [wikipedia].  It's a generalised bit of code that will allow me to extend it to making easy links to any site.  It doesn't have the smarts I added for the [youtube] tag, though; that one can take the video ID itself, but given a full Youtube URL it will extract the ID before putting it into the template.

Posted by: Pixy Misa at 11:14 PM | Comments (16) | Add Comment | Trackbacks (Suck)
Post contains 435 words, total size 3 kb.

Rant

That's Just Wrong

Invader Zim slash fanfic?

Eww.

Posted by: Pixy Misa at 12:30 AM | No Comments | Add Comment | Trackbacks (Suck)
Post contains 8 words, total size 1 kb.

Sunday, March 25

Cool

Some Day There Will Be Content

In the meantime, here's a video I found at LGF:


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Posted by: Pixy Misa at 01:29 PM | No Comments | Add Comment | Trackbacks (Suck)
Post contains 28 words, total size 1 kb.

Saturday, March 24

Blog

Hidden Spoilers Not Safe For Work



Secret message:
Spoiler for any random anime series:


This message brought to you by the tags [hide], [spoiler] and [nsfw].

Posted by: Pixy Misa at 07:31 PM | Comments (4) | Add Comment | Trackbacks (Suck)
Post contains 22 words, total size 1 kb.

Cool

Need For Physics 2

Sorry, I just added a [youtube] tag to Minx, and now I have to test it.

So:


Posted by: Pixy Misa at 02:11 PM | Comments (2) | Add Comment | Trackbacks (Suck)
Post contains 20 words, total size 1 kb.

Cool

Memes Gone Wild

I don't know how many of these there are out there, so here are a couple that I thought were good.

World of Warcraft version:


Disney version:


Scribbly cartoon version:

more...

Posted by: Pixy Misa at 12:05 AM | Comments (5) | Add Comment | Trackbacks (Suck)
Post contains 49 words, total size 1 kb.

Wednesday, March 21

Blog

Die, Spammer Bastids!

Got my first piece of spam since I moved across to mee.nu.  Took a look at the automated spam filter, and the cupboard was bare.

Minx uses two spam filters: A conventional URL/IP filter fed from a honeypot system, and the statistical system called Snark that I wrote late in 2005 to deal with trackback spam at munu.  Snark worked really well, getting rid of 99.8% of trackback spam with almost no false positives, until I accidentally clobbered its data files during the DDoS attacks.  New Snark uses MySQL, of course, making it less likely for me to accidentally clobber it.

Unfortunately, (a) the honeypot isn't catching any flies and (b) one spam isn't enough to feed a statistical anti-spam engine.

I think, first, I need to fix the honeypot, and second, I need to fix the comment moderation screen.  A Pixy's work is never done.  Particularly when said Pixy embarks on major web development projects...

Posted by: Pixy Misa at 06:22 PM | Comments (10) | Add Comment | Trackbacks (Suck)
Post contains 159 words, total size 1 kb.

Friday, March 16

Cool

Violence of the Lambs

Coming soon to a cinemaaa near you.

Posted by: Pixy Misa at 10:39 PM | Comments (3) | Add Comment | Trackbacks (Suck)
Post contains 11 words, total size 1 kb.

Geek

Hot Skynet-on-Skynet Action!

When we wake up one day to find that our computers have taken over the world, it won't be a top-secret military project behind it.

It will be a spam filter.

Posted by: Pixy Misa at 09:37 PM | Comments (6) | Add Comment | Trackbacks (Suck)
Post contains 34 words, total size 1 kb.

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