This is too bad. Shit happens I guess. After the Polar Lander was lost, I recall NASA saying they were going to use the orbiter to try to get images of the landing site to see if there was any sign of the lander. Were there any images released?
when i downloaded those 7 MB hires images, they ended up being 1-3 MB TIFF images. someone's exaggerating, or else they ended up replacing the images with smaller ones or something.
the primary purpose of doing radar imaging is so that you *can* see through clouds. Radar imaging was also used to map the surface of Venus, where all those clouds really get in the way.
radar imaging can also show what's beneath the ground to a certain depth. IIRC, radar imaging was also used to discover the remnants of ancient roads and trade routes crossing the african and middle eastern deserts that had been buried for centuries.
during my grad school days, i opted to be the department sys admin instead of doing the traditional TA things (also mostly because there were no traditional TA things like teaching or lecturing for me to do). i choose to call my machines (NeXT workstations and some office PCs thrown in for variety) after physicists who made significant contributions to radiological science. I had workstations named Roentgen, Curie, Bohr, Becquerel, Rutherford, Tesla, Anger. i've also used other physicists like newton and hubble.
i think names add character to the workstations. certainly much more interesting than meaningless borg-like designations used by the IT group of the hospital i'm at now (i have no involvement in IT or sys admining anymore). although i suppose for all these Windoze office peecees, a borg designation might be appropriate...:)
i think the point is that the technology to produce these kinds of images and the images themselves are now available for _commercial_ use instead of strictly military applications
A fair bit of information on the details can be found on the Radiation Safety Mailing list archives at http://www.ehs.uiuc.edu/~rad/radsafe.html. Search for "criticality AND Japan" or just "criticality". There are several informative posts there, including news releases that contain some of the details (some still a little sketchy).
how about the asteroid belt? i wonder if they considered the gravity of the asteroid belt in their calculations. sure, it's spread out and fairly diffuse, but i'm sure if you put it all together, it might have considerable mass. it's been a pretty long time since i attempted to calculate the gravitational attraction from a torus though.
The clock would measure different time than on earth due to relativisitic speeds; the total difference between earth time and space probe time would be a history of the probe's entire journey. It's pretty complicated. You'd have to know how far away the probe was in order to figure out how much of the time difference was due to distance and how much was due to time dilation.
but at the velocities the probe is travelling at, relativity has a negligible effect. Time dilation is proportional to 1/sqrt(1-beta^2) where beta = v/c. In this case, 27 000 mph ~ 12 km/s, so beta = 12/300000 ~ 0.00004. this means that for us as observers, we would see the probe's clock running slower by a factor of about 1.00000000324.
IIRC, there was an article in/. a few months ago about someone who did this very same thing with mindstorm. don't recall what the URL for the site was, but searching through/. might dig it out.
there were some pretty big tiff images there that i saw. the tiff of Cass A was 3+MB. could probably do some resizing with that to make it wall paper size.
I suppose cracking times can help show how vulnerable an encryption scheme is to brute force attacks. Whether it's a dedicated machine doing it (like EFF's Deep Crack) or a bunch of computers working part time on it (like with d.net), if the method can't stand up for very long to a brute force attack, are you going to use it? DES III fell in less than a day. Granted the key was found in the first 1/4 of the keyspace, but that still means less than a week to crack DES just by brute force.
Calculating how fast a keyspace can be searched is easy. The d.net effort is *showing* how fast it can be done. I think when DES III fell, everyone involved was shocked at just how fast it took, even though they could calculate the top keyrate, how fast it would take to ramp up to that keyrate, how many participants it would take, etc. it turned out to be a very graphic presentation on how weak DES is now. That's what the contest is about I think.
But d.net is about more than just cracking encryption. it's about the power of distributed computing. cracking just happens to be a good illustration of DC.
"when" is exactly the point of the d.net rc5 and DES efforts. the first DES contest took d.net what, a year or so to crack? the second fell in a few months, and the third DES contest completed in less than a day. the point is to show how long des/rc5 can stand up to brute force attacks.
their configuration seems to have root logins disabled unless you're at the console. telnet may be open, and you have the root password, but the box still isn't going to let you in. you still have to crack your way into the box
you know, something like this could be potentially more useful for detecting heart problems like heart attacks. it's been well established that heart related problems in women tend to get overlooked by doctors.
but according to their custom configurations page, "If panel size is your primary concern, MASS will build your monitor with any combination of 14.1, 15 or 18 inch panels" price will go up accordingly i'm sure
Slashdot Mirror
This is too bad. Shit happens I guess.
After the Polar Lander was lost, I recall NASA saying they were going to use the orbiter to try to get images of the landing site to see if there was any sign of the lander. Were there any images released?
not to sound like i'm complaining or anything.
the big hires images are still great. onto my background they go!
that's what i get for submitting before i preview...
when i downloaded those 7 MB hires images, they ended up being 1-3 MB TIFF images. someone's exaggerating, or else they ended up replacing the images with smaller ones or something.
the primary purpose of doing radar imaging is so that you *can* see through clouds. Radar imaging was also used to map the surface of Venus, where all those clouds really get in the way.
radar imaging can also show what's beneath the ground to a certain depth. IIRC, radar imaging was also used to discover the remnants of ancient roads and trade routes crossing the african and middle eastern deserts that had been buried for centuries.
during my grad school days, i opted to be the department sys admin instead of doing the traditional TA things (also mostly because there were no traditional TA things like teaching or lecturing for me to do). i choose to call my machines (NeXT workstations and some office PCs thrown in for variety) after physicists who made significant contributions to radiological science. I had workstations named Roentgen, Curie, Bohr, Becquerel, Rutherford, Tesla, Anger. i've also used other physicists like newton and hubble.
i think names add character to the workstations. certainly much more interesting than meaningless borg-like designations used by the IT group of the hospital i'm at now (i have no involvement in IT or sys admining anymore). although i suppose for all these Windoze office peecees, a borg designation might be appropriate...:)
imabug
i think the point is that the technology to produce these kinds of images and the images themselves are now available for _commercial_ use instead of strictly military applications
imabug
And you can actually buy it to install on your car! seems relatively cheap too.
imabug
The URL posted on the Ig Noble site should be http://www.yorku.ca/ dept/histarts/gradhist/grad_cv/penfold.htm
imabug
The prize awarded for medicine was just way too funny. A rotating table to facilitate with childbirth here.
A patent was actually awarded for it too!
imabug
The prize awarded for medicine was just way too funny. A rotating table to facilitate with childbirth here.
imabug
Just found an IAEA press release on the accident. Contains a few more details about what happened.i dent.shtml
http://www. iaea.org/worldatom/Press/P_release/1999/japan_inc
imabug
A fair bit of information on the details can be found on the Radiation Safety Mailing list archives at
http://www.ehs.uiuc.edu/~rad/radsafe.html. Search for "criticality AND Japan" or just "criticality". There are several informative posts there, including news releases that contain some of the details (some still a little sketchy).
imabug
how about the asteroid belt? i wonder if they considered the gravity of the asteroid belt in their calculations. sure, it's spread out and fairly diffuse, but i'm sure if you put it all together, it might have considerable mass. it's been a pretty long time since i attempted to calculate the gravitational attraction from a torus though.
imabug
The clock would measure different time than on earth due to relativisitic speeds; the total difference between earth time and space probe time would be a history of the probe's entire journey. It's pretty complicated. You'd have to know how far away the probe was in order to figure out how much of the time difference was due to distance and how much was due to time dilation.
but at the velocities the probe is travelling at, relativity has a negligible effect.
Time dilation is proportional to 1/sqrt(1-beta^2) where beta = v/c. In this case, 27 000 mph ~ 12 km/s, so beta = 12/300000 ~ 0.00004. this means that for us as observers, we would see the probe's clock running slower by a factor of about 1.00000000324.
imabug
IIRC, there was an article in /. a few months ago about someone who did this very same thing with mindstorm. don't recall what the URL for the site was, but searching through /. might dig it out.
there were some pretty big tiff images there that i saw. the tiff of Cass A was 3+MB. could probably do some resizing with that to make it wall paper size.
imabug
>BTW: 1) d.net client source is still closed. d.net is an insult to the Open Source community and we should have nothing to do with it.
i don't recall d.net ever having claimed to be open source, so how can it insult something it isn't?
imabug
I suppose cracking times can help show how vulnerable an encryption scheme is to brute force attacks. Whether it's a dedicated machine doing it (like EFF's Deep Crack) or a bunch of computers working part time on it (like with d.net), if the method can't stand up for very long to a brute force attack, are you going to use it? DES III fell in less than a day. Granted the key was found in the first 1/4 of the keyspace, but that still means less than a week to crack DES just by brute force.
Calculating how fast a keyspace can be searched is easy. The d.net effort is *showing* how fast it can be done. I think when DES III fell, everyone involved was shocked at just how fast it took, even though they could calculate the top keyrate, how fast it would take to ramp up to that keyrate, how many participants it would take, etc. it turned out to be a very graphic presentation on how weak DES is now. That's what the contest is about I think.
But d.net is about more than just cracking encryption. it's about the power of distributed computing. cracking just happens to be a good illustration of DC.
"when" is exactly the point of the d.net rc5 and DES efforts. the first DES contest took d.net what, a year or so to crack? the second fell in a few months, and the third DES contest completed in less than a day. the point is to show how long des/rc5 can stand up to brute force attacks.
imabug
their configuration seems to have root logins disabled unless you're at the console. telnet may be open, and you have the root password, but the box still isn't going to let you in. you still have to crack your way into the box
duh. Just go to the library and browse their copy for free. I haven't seen a library yet that doesn't carry Science.
>2) TN-1 is for 6 months not 1 year - my sister (a nurse) and many co-workers from our Toronto Branch can attest to this.
did INS change the TN rules recently?
my TNs were all for a 1 year term. I got my latest in March (third TN to date)
misplaced canuck
you know, something like this could be potentially more useful for detecting heart problems like heart attacks. it's been well established that heart related problems in women tend to get overlooked by doctors.
but according to their custom configurations page,
"If panel size is your primary concern, MASS will build your monitor with any combination of 14.1, 15 or 18 inch panels"
price will go up accordingly i'm sure
just bookmark your personal stats page. it'll take you there every time. I use it for my home page now.