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[PE] Supercomputer Unravels Structures In DVD Materials.

post #1 of 21
Thread Starter 


http://www.fz-juelich.de/portal/inde...ex=163&mid=810

Quote:
Although the storage of films and music on a DVD is part of our digital world, the physical basis of the storage mechanism is not understood in detail. In the current issue of the leading journal Nature Materials, researchers from Jülich, Finland, and Japan provide insight into the read and write processes in a DVD. This knowledge should enable improved storage materials to be developed.
Woah dude...

DVDs are intense
post #2 of 21
Quote:
The calculation of the structure of amorphous AIST is the largest yet performed in this area of research, with simulations of 640 atoms over the comparatively long time of several hundred picoseconds. Some 4000 processors of the Jülich supercomputer JUGENE were used for over four months in order to obtain the necessary precision.
    
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post #3 of 21
Jesus... So they basically re-organize the amorph mollecular structure into an hexagonal one via exciting the mollecules?

Geeze.
   
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post #4 of 21
Im not a professor or something, so i may not understand this right:
All this time people didnt know how physical basis of the storage mechanism works?
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post #5 of 21
Quote:
Originally Posted by Colt View Post
Im not a professor or something, so i may not understand this right:
All this time people didnt know how physical basis of the storage mechanism works?
Seriously, we know how to do it, but we don't know why? Holy bejesus, we have just been winging it.

There is another very similar physical structure change in Ferrous magnets at about 121K. Its called the Verwey Transition, and it basically is an object that is conductive and magnetic about 2K above 121K, then becomes extremely non-conductive at or just below transition. How it does this is still a little unknown.
Edited by RagingCain - 1/10/11 at 8:49am
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post #6 of 21
Thread Starter 
Quote:
Originally Posted by RagingCain View Post
Seriously, we know how to do it, but we don't know why? Holy bejesus, we have just been winging it.
Seemed to work out pretty well
post #7 of 21
I know I am totally impressed by us Humans for a change.
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post #8 of 21
Quote:
Originally Posted by RagingCain View Post
I know I am totally impressed by us Humans for a change.
No joke. That's pretty cool yet funny right there.
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post #9 of 21
Quote:
Originally Posted by Colt View Post
Im not a professor or something, so i may not understand this right:
All this time people didnt know how physical basis of the storage mechanism works?
They don't know exactly how, but they know it works...

To give you another example, you can use a so-called Phase-conjugate-mirror in some experiments.

It works very well, and corrects defects in your optical front-wave, but...
You use that effect the time it is established in a given material, no-one knows what is happening really during the transient time ....

We know it works, but how it does "really" take place in the material is a mystery.
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post #10 of 21
Quote:
Originally Posted by RagingCain View Post
Seriously, we know how to do it, but we don't know why? Holy bejesus, we have just been winging it since the beginning of recorded history.
Fixed it for you.

It's not likely anyone knew why eating moldy bread or chewing some tree bark would make you feel better until recently.
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