I believe that the density is measured by the volume of the cube divided by the mass of the cube. (In many cases it's also motioned that 98.8% of an aerogel is empty space.) But keep in mind that the truly remarkable feature about this is the scale at which this occurs. The framework that makes up an aerogel is so fine that the individual components are around 3-5 nanometers in thickness. (An atom is about 0.1nm).
In your aluminum example the average density of the space defined by the cube would be less dense. But the foil that makes up its walls is easily discernable from the air. It might be easier to think of an aerogel like a sponge, or angel food cake where there are tunnels of air (or empty space if you'd rather) in the material. But in the case of the aeogel the tunnel are microscopically small complex in shape.
The short answer is that yes it could, but only temporarily.
I believe Aerogel is an open celled matrix, meaning that the eventually the hydrogen (especially hydrogen) would leak out causing a block of the stuff to return to the ground.
I suppose it would be possible to seal a block of aerogel in some sort of polymer making for a structurally solid balloon.
The best way I know of is a little backwards. The first step is to find the closest anime convention in your area. The Anime Web Turnpike is a good spot for this. There con page is here
Once you find a local con, find out who is sponsoring it. There is usually one or two anime stores in the area that are paying for ad space. Also see if there is a MediaPlay or a Suncoast store near you. They tend have a pretty decet selection of anime. Good luck.
Computers, while relatively new, are a rapidly changing medium. And one that has entered into just about every facet of modern life. (There are people who study the history of mass media!)
To some all the subtle changes from one system to the next might be a practice in detail.
But ask any engineer, and they'll tell you, that for a project of any significantly large enough scale, the devil is in those details! And there is probably a good number of people who are willing to pay for someone who knows how to find those details.
^$1 for the chalk mark, $49,999 for knowing where to put it!^
Somplace that might need this position..
on
Computer Historian?
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· Score: 1
... is a large university. Especailly ones with strong Computer Science departments.
Part of the duty of such a historian would be to help provide a means of translating old stored data to newer mediums. As well as similar duties for the transcripton of old code.
If industry has percieved a serious need for this, then they have probably pulled few monitary strings, and courses on such subjects might be appearing. A lot of colleges work closely with industy to determine what skills need to be taugt. (I'm not a CS major, so I can't speak from personal experience for that field).
It also makes sense that a Univeristy might have enough space and funds to maintain a library/museum of old data and data storage devices. If only to maintain thier own records and to provide (sell) this service to smaller companies that can't afford to do it themselves.
Failing that, I can guess with about 90% certainty that the Smithsonian, or Library of Congress (which collects all forms of media) might have deparments dedicated to the history of computers. (If not, they should!)
After reading the article, and the comments posted here I found had a question that seemed to be near the root of the issue.
Many comparisons to physical tresspass have been used as a means to demostrait ebay's legal case, but "there's no ^there^, there".
Since ebay is not a physical location, can tresspass law be applied? I'm not a legal expert in any form, so please let me know if any of my assumptions are incorrect.
Ebay displays content. Content that they get paid to display, and that they accept from clinets with various understood contrats. (items are thires to sell, they are items that are legal to sell.. etc. etc.)
Now they have a person who is fraduiently given them content, and using the fact that ebay has a huge amount of content to wade through to exploit cracks in thier system (vulnerability to multiple I.Ds)
So they banned this person, but with no effect. Is thier intent for a federal ruling to have a means to persue more stringent actions (read: money). Until now they have had only one recourse, banning the I.D., which as stated before, has had only limuited sucess.
My main question is, since no one has actaully stepped foot someplace they shouldn't, but rather exploited a hole in ebay's system, what sort of infraction is this?
Good thing the fuel for this very specailized aircraft also had a very high vapor pressue (it wouldn't evaporate easily at sea level), or else those leaks would have kept this Blackbird on the ground.
You idea is esstially correct, and a lot of research is being done with air breathing rocket engines. However, the main reason why rockets carry thier oxidizers is that they fly vertically instead of horizontally. As you gain altitutde th character of the atmosphere changes drastically. It thins, the ambient pressure drops, its oxygen content changes, and its temperature drops (then rises, then drops again. In addition air contains a large amount of nitrogen, an intert gas that will do very little to contribute to the genreation fo thurst. Designing an engine that can cope with the full range of changes from sea level to near vacuum would require a level of complexity that is staggering. Most jet aircraft are designed around a small rage of altitudes that it will be flying in. Passengre jets are horribly inefficient at take off, and the SR-71 (famous for its mach 3+ speed) is also known for being totally useless at low altitues and low speeds. To use "off the shelf" technology a hypothetical spacecraf would need to switch from turbo jets, to ramjets, then on to scram jets and maybe rockets.. as was proposed in Spaceplane project. Each engine being designed for a specific rage of altitiudes. Air breathing rockets are possible, but not yet practical. I am not a NASA opffical, but I do have a degree in Aerospace Engineering if you were wondering.
Slashdot Mirror
I believe that the density is measured by the volume of the cube divided by the mass of the cube. (In many cases it's also motioned that 98.8% of an aerogel is empty space.) But keep in mind that the truly remarkable feature about this is the scale at which this occurs.
The framework that makes up an aerogel is so fine that the individual components are around 3-5 nanometers in thickness. (An atom is about 0.1nm).
In your aluminum example the average density of the space defined by the cube would be less dense. But the foil that makes up its walls is easily discernable from the air. It might be easier to think of an aerogel like a sponge, or angel food cake where there are tunnels of air (or empty space if you'd rather) in the material. But in the case of the aeogel the tunnel are microscopically small complex in shape.
The short answer is that yes it could, but only temporarily.
I believe Aerogel is an open celled matrix, meaning that the eventually the hydrogen (especially hydrogen) would leak out causing a block of the stuff to return to the ground.
I suppose it would be possible to seal a block of aerogel in some sort of polymer making for a structurally solid balloon.
The best way I know of is a little backwards. The first step is to find the closest anime convention in your area. The Anime Web Turnpike is a good spot for this. There con page is here
Once you find a local con, find out who is sponsoring it. There is usually one or two anime stores in the area that are paying for ad space.
Also see if there is a MediaPlay or a Suncoast store near you. They tend have a pretty decet selection of anime.
Good luck.
I would have to argue,
Computers, while relatively new, are a rapidly changing medium. And one that has entered into just about every facet of modern life. (There are people who study the history of mass media!)
To some all the subtle changes from one system to the next might be a practice in detail.
But ask any engineer, and they'll tell you, that for a project of any significantly large enough scale, the devil is in those details! And there is probably a good number of people who are willing to pay for someone who knows how to find those details.
^$1 for the chalk mark, $49,999 for knowing where to put it!^
... is a large university. Especailly ones with strong Computer Science departments.
Part of the duty of such a historian would be to help provide a means of translating old stored data to newer mediums. As well as similar duties for the transcripton of old code.
If industry has percieved a serious need for this, then they have probably pulled few monitary strings, and courses on such subjects might be appearing. A lot of colleges work closely with industy to determine what skills need to be taugt. (I'm not a CS major, so I can't speak from personal experience for that field).
It also makes sense that a Univeristy might have enough space and funds to maintain a library/museum of old data and data storage devices. If only to maintain thier own records and to provide (sell) this service to smaller companies that can't afford to do it themselves.
Failing that, I can guess with about 90% certainty that the Smithsonian, or Library of Congress (which collects all forms of media) might have deparments dedicated to the history of computers. (If not, they should!)
Good Luck with your search!
After reading the article, and the comments posted here I found had a question that seemed to be near the root of the issue.
Many comparisons to physical tresspass have been used as a means to demostrait ebay's legal case, but "there's no ^there^, there".
Since ebay is not a physical location, can tresspass law be applied? I'm not a legal expert in any form, so please let me know if any of my assumptions are incorrect.
Ebay displays content. Content that they get paid to display, and that they accept from clinets with various understood contrats. (items are thires to sell, they are items that are legal to sell.. etc. etc.)
Now they have a person who is fraduiently given them content, and using the fact that ebay has a huge amount of content to wade through to exploit cracks in thier system (vulnerability to multiple I.Ds)
So they banned this person, but with no effect. Is thier intent for a federal ruling to have a means to persue more stringent actions (read: money). Until now they have had only one recourse, banning the I.D., which as stated before, has had only limuited sucess.
My main question is, since no one has actaully stepped foot someplace they shouldn't, but rather exploited a hole in ebay's system, what sort of infraction is this?
You idea is esstially correct, and a lot of research is being done with air breathing rocket engines. However, the main reason why rockets carry thier oxidizers is that they fly vertically instead of horizontally. As you gain altitutde th character of the atmosphere changes drastically. It thins, the ambient pressure drops, its oxygen content changes, and its temperature drops (then rises, then drops again. In addition air contains a large amount of nitrogen, an intert gas that will do very little to contribute to the genreation fo thurst. Designing an engine that can cope with the full range of changes from sea level to near vacuum would require a level of complexity that is staggering. Most jet aircraft are designed around a small rage of altitudes that it will be flying in. Passengre jets are horribly inefficient at take off, and the SR-71 (famous for its mach 3+ speed) is also known for being totally useless at low altitues and low speeds. To use "off the shelf" technology a hypothetical spacecraf would need to switch from turbo jets, to ramjets, then on to scram jets and maybe rockets.. as was proposed in Spaceplane project. Each engine being designed for a specific rage of altitiudes. Air breathing rockets are possible, but not yet practical. I am not a NASA opffical, but I do have a degree in Aerospace Engineering if you were wondering.