The RTG's (radioisotope thermal generators) on the Voyager probes are spec'ed for 400 watts electrical from 1800 watts thermal. That's decent efficiency compared to these. And that was thermocouple based.
resolution is a function of the aperture size of the telescope. In hubble's case, this is 2.5 meters (according to space.com). I don't remember what this function is, but it has to do with the wavelength of the signal too. Something along the lines of d/lambda. And you get a resolution of angle out of it because you don't know the distance to your target.
Note that this will be the maximum theoretical resolution, Hubble is probably less. (and that I could be wrong, but I'm pretty sure about the aperture to resolution relation).
Also, since this is a radio telescope, you're not going to see optical pictures of planets out of them.
They'll be nice to look at, say, jets coming off neutron stars and such at higher resolution, or things that are major radio sources already. I doubt that they can pick up faint radio sources (powerwise) because the antennas they're using are definitely not earth-sized.
This is also why some large ground telescopes can see farther than hubble because they have a larger light collecting area.
speaking of bits being magnetically unstable, this reminds me a bit of DRAM and, if you want to get older, mercury delay lines.
Not sure if current HDs have to continually refresh their data, but it seems that they might have to do that in the future. It would be a challenge to do with huge drive sizes though, because the drive controller would probably be the component in charge of the refreshes. However, if the data retention limits really were still measured in years (albiet small numbers), it might still have a chance without impacting performance too much.
with higher bit lengths on the encryption, depending on the protocols used, you could load up a significant portion of trafic on key exchange, but that's very periphery and a minor problem.
Even worse is that qc's decrypting your streams might approach the speed of you decrypting your streams since the qc can now do it in poly time. If that happens, it'll be as if you didn't use encryption at all, but there will still be the problem of figuring out what's worthy of looking at, given that all data streams are open.
It might be because it's almost 3 in the morning, but I can't decide whether your post would rate an 'insightful' or 'funny'.
There's also this thing about people wanting to believe that there's life on mars so they'll probably go even though they figure out how the magnetite got formed.
btw, anyone have any luck with the link to the press release on ftp? It seems to be asking for id/auth once in a while.
If I remember correctly, this is because two heads used to cause signal interference problems with each other since the signals coming off the heads are so small to begin with.
If you can scan a CD, why not just scan something non-round? Your scanner obviously has the resolution, and since what you're proposing entails relatively high scan speeds, scanning a square or rectangle would give you more data per area.
have you considered discharing through your flash lamps instead of a thyristor, or flash lamp supplementing your thyristor? I'm not sure if it would work or not and you will lose power and not get the full voltage drop and probably burn them out in the process, but you already have them and it'd look pretty neat to have the flash go with the projectile.
but it's late. They didn't consider roll-over in 1974, and now that it's 2002 it's come back on because it doesn't know enough to stay off. Talk about sloppy programming: y2k problem _and_ it's off by a couple of years. But you might be able to attribute that to clock driff...
well, since it took about 13 seconds to do that, and assuming that the other end had some way of telling them that they were done, maximum ping time would be 13 seconds. (and assuming that the machine at the other end didn't choke on that much data and die)
But why worry about ping times? I'd gladly set up a modem line between those two places to handle control traffic if I can even have one way bandwidth like that.
This seems similar to the hawaii article that ran on/. a while ago, but the implications here are more commercial. While I can see how the non-commercial aspects of the hawii thing would work out, I'm not sure how they're going to get different groups to work together in this case. Maybe it'll just slow things down.
not that I play solitaire myself, but what if they took that out of modular windows? people who spend all their time playing it wouldn't know what to do anymore.
Interesting that this was issued to take effect in 60 days (late June) [now, is this 60 real days or 60 business days?]. If this school district is anything like the school districts I'm familiar with, they would just be gearing down for end of term at around that time.
I sure wouldn't want disruptions then. I wonder why they didn't time it so that the audit had to happen mid-summer or some other non-peak time instead.
laser links
on
Hawaii Wi-Fi
·
· Score: 2, Insightful
The article doesn't mention laser/optical links, but it seems to me that that would be an alternative to the DSL and T1 lines they have connecting base sites already. With the optical link method, potentially, you can connect up lots more base sites without laying down more wiring.
Of course, everything might get out of alignment when they have an earthquake...
reading from the article, they seem to say that diradicals like O2 are already bonded and not very magnetic. I remember the LOx and magnet demonstration in chemistry class, and it wasn't that impressive. What these guys have done is find a molecule/compound that doesn't bond (and doesn't lose the magnetic effects of being a diradical)
anyway, quoting from the article:
Several research groups worldwide have shown that materials based on "diradicals" will be even more magnetically active. In a diradical, two atoms, which are close to each other, have electrons ready to form a bond. And indeed, the difficulty is that usually the bond is formed, resulting in no magnetism.
Slashdot Mirror
The RTG's (radioisotope thermal generators) on the Voyager probes are spec'ed for 400 watts electrical from 1800 watts thermal. That's decent efficiency compared to these. And that was thermocouple based.
but then I could check google and find out that hubble has resolution of "less than 0.1 arcseconds"
t s/ res101.shtml
http://hubblesite.org/sci.d.tech/nuts_.and._bol
resolution is a function of the aperture size of the telescope. In hubble's case, this is 2.5 meters (according to space.com). I don't remember what this function is, but it has to do with the wavelength of the signal too. Something along the lines of d/lambda. And you get a resolution of angle out of it because you don't know the distance to your target.
Note that this will be the maximum theoretical resolution, Hubble is probably less. (and that I could be wrong, but I'm pretty sure about the aperture to resolution relation).
Also, since this is a radio telescope, you're not going to see optical pictures of planets out of them.
They'll be nice to look at, say, jets coming off neutron stars and such at higher resolution, or things that are major radio sources already. I doubt that they can pick up faint radio sources (powerwise) because the antennas they're using are definitely not earth-sized.
This is also why some large ground telescopes can see farther than hubble because they have a larger light collecting area.
quote from the article:
"Microsoft suggests users view hidden codes in every document they open"
Most people I know don't even like looking at non-printable characters...
While they're at it, they may as well suggest that everyone examine binaries manually before they run them.
speaking of bits being magnetically unstable, this reminds me a bit of DRAM and, if you want to get older, mercury delay lines.
Not sure if current HDs have to continually refresh their data, but it seems that they might have to do that in the future. It would be a challenge to do with huge drive sizes though, because the drive controller would probably be the component in charge of the refreshes. However, if the data retention limits really were still measured in years (albiet small numbers), it might still have a chance without impacting performance too much.
with higher bit lengths on the encryption, depending on the protocols used, you could load up a significant portion of trafic on key exchange, but that's very periphery and a minor problem.
Even worse is that qc's decrypting your streams might approach the speed of you decrypting your streams since the qc can now do it in poly time. If that happens, it'll be as if you didn't use encryption at all, but there will still be the problem of figuring out what's worthy of looking at, given that all data streams are open.
It might be because it's almost 3 in the morning, but I can't decide whether your post would rate an 'insightful' or 'funny'.
There's also this thing about people wanting to believe that there's life on mars so they'll probably go even though they figure out how the magnetite got formed.
btw, anyone have any luck with the link to the press release on ftp? It seems to be asking for id/auth once in a while.
If I remember correctly, this is because two heads used to cause signal interference problems with each other since the signals coming off the heads are so small to begin with.
Obviously they got around that problem now.
If you can scan a CD, why not just scan something non-round? Your scanner obviously has the resolution, and since what you're proposing entails relatively high scan speeds, scanning a square or rectangle would give you more data per area.
this reminds me more of the "if cars were like computers" thing from bill gates.
http://www.cobalt-blue.com/humor/gates.htm
have you considered discharing through your flash lamps instead of a thyristor, or flash lamp supplementing your thyristor? I'm not sure if it would work or not and you will lose power and not get the full voltage drop and probably burn them out in the process, but you already have them and it'd look pretty neat to have the flash go with the projectile.
no, I'm a canadian, and I know about monday. It's just that I didn't expect the article to be on a .gc.ca site.
the canadian government could be slashdotted. Now that would be something - and on July 4th too no less.
And if the server loads go up too much, maybe the dust in them could go up in smoke too - and that'll be irony for you.
but it's late. They didn't consider roll-over in 1974, and now that it's 2002 it's come back on because it doesn't know enough to stay off. Talk about sloppy programming: y2k problem _and_ it's off by a couple of years. But you might be able to attribute that to clock driff...
well, since it took about 13 seconds to do that, and assuming that the other end had some way of telling them that they were done, maximum ping time would be 13 seconds. (and assuming that the machine at the other end didn't choke on that much data and die)
But why worry about ping times? I'd gladly set up a modem line between those two places to handle control traffic if I can even have one way bandwidth like that.
(unless your post was meant to be funny)
This seems similar to the hawaii article that ran on /. a while ago, but the implications here are more commercial. While I can see how the non-commercial aspects of the hawii thing would work out, I'm not sure how they're going to get different groups to work together in this case. Maybe it'll just slow things down.
0 21 0
http://slashdot.org/article.pl?sid=02/03/13/194
not that I play solitaire myself, but what if they took that out of modular windows? people who spend all their time playing it wouldn't know what to do anymore.
better still, part of the EULA that bach used could have prohibitted using xp embedded against ms in court.
kirk didn't get revived. He got 'lost' and then 'found' again.
12.5% of the light on the screen, I believe (showing that polarising light is not a classical physics thing)
Didn't read the article, but this comment raised an intersting point.
what if your 'friend' turns out to be one of those mail archive things that you can view on the web. Can you then link to the archive?
Of course the site might not want you to use their bandwidth, but getting through the indirect route will probably cost them more.
Unless the email contains disclaimers that prevent that.
Interesting that this was issued to take effect in 60 days (late June) [now, is this 60 real days or 60 business days?]. If this school district is anything like the school districts I'm familiar with, they would just be gearing down for end of term at around that time.
I sure wouldn't want disruptions then. I wonder why they didn't time it so that the audit had to happen mid-summer or some other non-peak time instead.
The article doesn't mention laser/optical links, but it seems to me that that would be an alternative to the DSL and T1 lines they have connecting base sites already. With the optical link method, potentially, you can connect up lots more base sites without laying down more wiring.
Of course, everything might get out of alignment when they have an earthquake...
reading from the article, they seem to say that diradicals like O2 are already bonded and not very magnetic. I remember the LOx and magnet demonstration in chemistry class, and it wasn't that impressive. What these guys have done is find a molecule/compound that doesn't bond (and doesn't lose the magnetic effects of being a diradical)
anyway, quoting from the article: