Some people consider this to be the oldest surviving photograph. There was a fashion in Italy where artists used a 'camera obscura' to help them draw accurately.
Photoreactive chemicals were known (could be derived from seaweed and silver). It would be a simple step to think of putting this chemical on canvas and "photographing" a statue or something immobile.
Hmm, I think this might even work... Wonder if I can scrounge some ceramic superconductor + liquid nitrogen to take this to the next level:)
Re:so, you people want to build a gun eh?
on
Homemade Gauss Gun
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· Score: 1
I built a 5kV power supply that ran off a 9V battery.
Not a great achievement, first make AC with a couple of medium power transistors, put that into a ferrite cored transformer, then put the 100 or so volts that come out up a diode/capacitor ladder
I used to work at a hospital, near the MRI. The huge field from this thing did... interesting things to monitors. Generally we got iiyamas because they were slightly more resistant than the other makes, but the build in degaussing coil was never up to the job. One of the technicians had a high current transformer and a frame with thick copper wire wrapped round it to degauss manually.
Computers especially close to the magnet had to be housed in a special steel alloy, referred to as 'mu' metal.
We once got one mac, for some training software. The monitor it came with went 30 degrees sideways permanently...
I seem to remember the guy was selling it with several hundred karma. However, when word got out it began to 'tick down' as the time to the deadline approached.
I think the point is that you can mess with the material so you can shift the cross section to different points. I didn't manage to get the abstract, but when Nature arrives I may post my understanding of the paper.
From the ScienceNews Site it doesn't seem that revolutionary to be honest.
These aren't exactly new, but this is a new(ish) way of getting larger bandwidths. Before you have been more limited by the physical properties of your material, which meant you had to use interesting carcinogenic dyes, or expensive crystals to get broad stimulated emission cross sections.
I'd publish my course notes on the issue, but I'm not certain my prof would be too happy. I'll check with him when I see him Monday.
The world has stopped, people live in endless sunshine. But the endless sun causes infertility etc, so one person from the twilight area goes into the dark side to find this mad scientist and get him to turn the world.
In the end the scientist does turn the world, by 180 degrees and stops.
The moral is: when talking with scientists, be precise.
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Some people consider this to be the oldest surviving photograph. There was a fashion in Italy where artists used a 'camera obscura' to help them draw accurately.
Photoreactive chemicals were known (could be derived from seaweed and silver). It would be a simple step to think of putting this chemical on canvas and "photographing" a statue or something immobile.
Oh, I thought you said 'exploit' system...
:)
I hope your servers/links are up to it. Additionally, note that with >1k people in a channel just the joins and parts will flood off modem users.
I've seen it happen, not a pretty sight.
The proper non-root method would be 'smbmount' :)
Slashdot requires you to wait 20 seconds between hitting 'reply' and submitting a comment.
It's been 19 seconds since you hit 'reply'!
I hate that.
I have 2 5.25" FDDs, the best thing about them was reformatting those 360k apple ][ disks to 1.2 megs!
I wonder what a modern bios will say if asked to use them
bios: wtf! I'm a modern bios, and you want me to work with this rubbish?!
Hmm, I think this might even work... Wonder if I can scrounge some ceramic superconductor + liquid nitrogen to take this to the next level :)
I built a 5kV power supply that ran off a 9V battery.
Not a great achievement, first make AC with a couple of medium power transistors, put that into a ferrite cored transformer, then put the 100 or so volts that come out up a diode/capacitor ladder
I used to work at a hospital, near the MRI. The huge field from this thing did... interesting things to monitors. Generally we got iiyamas because they were slightly more resistant than the other makes, but the build in degaussing coil was never up to the job. One of the technicians had a high current transformer and a frame with thick copper wire wrapped round it to degauss manually.
Computers especially close to the magnet had to be housed in a special steel alloy, referred to as 'mu' metal.
We once got one mac, for some training software. The monitor it came with went 30 degrees sideways permanently...
I seem to remember the guy was selling it with several hundred karma. However, when word got out it began to 'tick down' as the time to the deadline approached.
doesn't seem to have any tuning capabilities, for me that'd make it a killer app. I'm getting irritated with my wintv PVR ;)
I remember reading a review of the first portable SPARC laptop, that had water cooling.
That was in Byte/UK in 1993
Having seen a terawatt laser I am hard to impress :P
It's all from my notes of a lecture course. No handouts.
For the curious: My notes from introductory course on lasers
(got an email response)
I need to keep him more or less happy as he is helping me significantly with some other projects.
:P
He may become unhappy if my crappy notes make him look bad
I can't see it being simple to modulate the laser to do that, but generally modulating the laser isn't much good for high bitrates.
The trouble is the very power modulation can cause shifts in frequency (due to ohmic heating), leading to unwanted losses and cross talk.
Better to have an external modulator which can change its loss at various frequencies, and use this as the source.
I think the point is that you can mess with the material so you can shift the cross section to different points. I didn't manage to get the abstract, but when Nature arrives I may post my understanding of the paper.
From the ScienceNews Site it doesn't seem that revolutionary to be honest.
Can I have some of what you're drinking
(not got my PhD yet)
Nd:YAG is fairly narrow linewidth at 1064nm. The green is frequency doubled(532nm), in a nonlinear crystal.
To get blue frequency tripling is often used, but each nonlinear element reduces the intensity greatly.
These aren't exactly new, but this is a new(ish) way of getting larger bandwidths. Before you have been more limited by the physical properties of your material, which meant you had to use interesting carcinogenic dyes, or expensive crystals to get broad stimulated emission cross sections.
I'd publish my course notes on the issue, but I'm not certain my prof would be too happy. I'll check with him when I see him Monday.
I would be quite happy if the entire 'info' system dissapeared off the face of my installation, permanently.
It's a pita to use/write/index
man forever!
More than just one boring, rather useless "base," it should cover MANY bases
All our bases? (Sorry)
Is there a templates dir?
I'll find out in 10mins, apt-getting as I type.
The world has stopped, people live in endless sunshine. But the endless sun causes infertility etc, so one person from the twilight area goes into the dark side to find this mad scientist and get him to turn the world.
In the end the scientist does turn the world, by 180 degrees and stops.
The moral is: when talking with scientists, be precise.
now you've posted that address on /. some poor admin at yourdomainhere.com is getting spammed to hell and back. I hope you're satisfied.