Actually, in classical molecuar dynamics, the algorithm is usually N^2. However, in this case "N" is the number of _electrons_, not atoms, i.e. 42000 electrons.
Oh, and this is not classical physics, but QM. Thus each electrons wave function has to be represented by a (possibly substantial) set of basis functions. Not sure if anyone's been able to get Density Functional Theory (DFT) to scale that high, but if so, DFT scales as (IIRC) either N^7 or N^9. Ouch! Sure there are tricks, such as pseudopotentials that "lump" the inner electron-shells with the nucleus, but still it'd be quite a big deal, and require quite some big iron.
FWIW, I ran some very simple DFT calculations with only ONE atom that took roughly 1-second on a single Power5 processor. Unfortunately for me, I needed to do several million of them -- hence why I ran on a 500 processor machine a block away from BlueGene/L.
impossible for a discrete-state system to model quantum mechanical events Huh? QM was a while ago, but I'm afraid you'll have to give a reference or two. You're saying that Density Functional Theory is impossible? The authors (of DFT) did win the Nobel proze a while ago, so I'm sure I'm missing something. Mind you, any implementation is only an approximation, but that's true of almost any computational method.
No, not unless the american people elect a congress that gives a damn about something other than big corporate sponsors. That's the only reason I can think of why the US doesn't have a law that makes businesses responsible for safeguarding personal information. According to "free market" forces your SSN and credit history is only another product, much less something to be protected.
I've been hit three times myself in the last 4 months. What am I supposed to do, sue three $50B corporations?
Oh, and don't believe the neanderthals that tell you the free market lets you "vote with your business" -- not when everyone seems to be involved.
After installing Windows and Office, you'll only have room for a few hours of virtual reality porn.
Seriously though, HD video is "already" 1080x1920. Up the bit-depth and frame rate, and an uncompressed video stream is pretty huge. 10 years ago who would have thought of 60GB of (compressed) music in your pocket?
I have no doubt that we'll find a way to fill a TB disk. The more serious question: will one be in control of one's own data, or will the MPAA/RIAA/MSoft charge you $0.02 every time you do a directory listing or open a file?
Technology should move at the speed of profitability, not humanity's best interest.
And this is exactly why there are no more antibiotics on the horizon -- much more profit in Viagra.
Sorry, government should (IMHO) take charge in those areas where something is in humanity's best interest, but is not yet profitable. Once things are profitable, the gov't can get out of the way. Private industry is too focused on short-term profit to care much about anything else.
The Sun and Moon have significant effects on satellite orbits and I would hope that GPS already accounts for these. I'd give exact numbers, but my copy of B.M.W. is elsewhere -- I recall that it is on the order of 10%.
Given the fascist tendencies of the modern conservative movement this has more characteristics of the latter than the former.
Not that you're going to bother supporting that comment, obviously. Just light the fuse and pretend that's somehow insightful. Evidence, reason, logical argumentation - these are the implements of lesser men, right?
I would think that the parent's statement should be perfectly obvious to any open minded and informed individual.
W's Whitehouse has done more to inflate the power of the Presidency at the expense of both Congress and the Bill of Rights than any president since Nixon. They admit this, and are quite proud of it (although they don't mention Nixon). It's pissing off quite a lot of traditional conservatives, who believe in state's rights and smaller government.
Whatever happened to "uphold and defend the Constitution of the United States."
Examples: Secrets act FISA Unusual definition of "torture"
Mars Global Surveyor had severe structural damage. Nevertheless, I agree that most problems in spacecraft are electronics and software. I'd think that this technology would be more useful in fatigue-prone high performance structures such as aircraft.
And besides, maybe if they did force everyone to use DRM, it would stop the whole "buy 10,000 email addresses for $10" kind of privacy violations we see rampantly all over the US.
No, it would make such privacy violations worse. DRM is all about _other people_ controlling your computer, and your data. This is compatible with neither privacy, nor security. EFF is a good place to read about this. Cory Doctorow has discussed this in depth as well (an EFF fellow).
I was lucky enough to have Prof Leith teach my optics class at Michigan about 10 years ago. At one point, he took the entire class over to his lab to show his latest work as well as share his outstanding personal holography collection. Still recall the 20"x30" self-portrait he received from a Soviet scientist: amazingly crisp and clear (used Dichromated gelatin rather than film). Always had stories to tell...
Try to patent something that the government thinks should be (or is) secret and suddenly you'll find you no longer have any rights to it. Not sure if they are required to pay you, although Feynman eventually did manage to get $1 for the idea of a nuclear submarine...
Re:Easy counter measures, not worth killing whales
on
Sonic Torpedo Defense
·
· Score: 1
Uh, just in case people didn't RTFA (I know, this is slashdot), we're not talking about a "loud sound" -- this is a shock wave. Think explosion, and you'll be close.
Essentially what they intend is a accoustic phased-array that allows them to focus the output of all 360 kilowatt (?) class "speakers" into a very small area. Imagine 360,000 watts of stereo sound brought to a focus _inside_ your head.
As for the environmental effects: One must always consider the sailor's lives, and the diesel etc. But it does deserve some serious thought from someone who is qualified. Note this does not mean a representative from the fishing industry.
it's actually more difficult to properly admin a Windows box well
I find 00 buckshot works quite well.
Seriously though, IIS runs really poorly on Linux too. Insist on such combinations and you get what you deserve. Did anyone investigate SAP before spending two weeks trying to get it running? I also find it quite hard to believe that they were getting crashes every week or so. Although I avoid RedHat...
Does the Kernel require copyright assignments like GCC? I'd think this could allow the assignee to change the license etc. Not sure this is the case though: GCC development appears (IMHO) to be much more structured than the Kernel -- for better or worse.
A third party implementation won't help: this decision (IMHO) will just cause more game developers on MS to abandon OpenGL in favor on DirectX. I'd bet some third party OpenGL library would be more trouble than it's worth for most.
Yup, just a variation on embrace, extend, extinguish. So what someone needs to due is sue. Of course that may not work either: although Sun got $900M, Java on MS is still broken unless you download Java yourself.
Wonder how many of these options I'll have available when the regional telco takes over my DSL line?
Zero. Any the infrastructure will be so oversubscribed that your "6mb" service will actually deliver about 40kbps. I know from experience...
Whoever said this regulation was supposed to help anyone other than the duopolists it will create? 'Tis what 51% of the american people voted for in the last election (EPA run by the chemical industry, Interior run by the Mining industry, etc).
Bullshit -- only if there is _real_ competition! There is no competition in the local phone and power industries (at least not here). So deregulating these industries does nothing for the consumer other than make them bend over. I can't wait until the same applies to DSL.
Futhermore, a free market only leads to maximization of profits. We need _some_ regulation to enforce other limits that society desires (environmental protection, limit bribery and corruption etc). Those who would argue that the consumer could uphold these "societal limits" via choice have a poor understanding of marketing and human nature.
The problem with DSL, phone, cable, and power is that the infrastructure required to provide these services requires huge capital investments that virtually preclude meaningful competition for all but a few markets with high population densities. And don't forget that an aweful lot of that infrastructure was initially funded by the government.
Slashdot Mirror
Actually, in classical molecuar dynamics, the algorithm is usually N^2. However, in this case "N" is the number of _electrons_, not atoms, i.e. 42000 electrons.
Oh, and this is not classical physics, but QM. Thus each electrons wave function has to be represented by a (possibly substantial) set of basis functions. Not sure if anyone's been able to get Density Functional Theory (DFT) to scale that high, but if so, DFT scales as (IIRC) either N^7 or N^9. Ouch! Sure there are tricks, such as pseudopotentials that "lump" the inner electron-shells with the nucleus, but still it'd be quite a big deal, and require quite some big iron.
FWIW, I ran some very simple DFT calculations with only ONE atom that took roughly 1-second on a single Power5 processor. Unfortunately for me, I needed to do several million of them -- hence why I ran on a 500 processor machine a block away from BlueGene/L.
impossible for a discrete-state system to model quantum mechanical events
Huh? QM was a while ago, but I'm afraid you'll have to give a reference or two. You're saying that Density Functional Theory is impossible? The authors (of DFT) did win the Nobel proze a while ago, so I'm sure I'm missing something. Mind you, any implementation is only an approximation, but that's true of almost any computational method.
No, not unless the american people elect a congress that gives a damn about something other than big corporate sponsors. That's the only reason I can think of why the US doesn't have a law that makes businesses responsible for safeguarding personal information. According to "free market" forces your SSN and credit history is only another product, much less something to be protected.
I've been hit three times myself in the last 4 months. What am I supposed to do, sue three $50B corporations?
Oh, and don't believe the neanderthals that tell you the free market lets you "vote with your business" -- not when everyone seems to be involved.
What will you put on [a TB disk]?
After installing Windows and Office, you'll only have room for a few hours of virtual reality porn.
Seriously though, HD video is "already" 1080x1920. Up the bit-depth and frame rate, and an uncompressed video stream is pretty huge. 10 years ago who would have thought of 60GB of (compressed) music in your pocket?
I have no doubt that we'll find a way to fill a TB disk. The more serious question: will one be in control of one's own data, or will the MPAA/RIAA/MSoft charge you $0.02 every time you do a directory listing or open a file?
Dibs on WhiteHouse.xxx
Technology should move at the speed of profitability, not humanity's best interest.
And this is exactly why there are no more antibiotics on the horizon -- much more profit in Viagra.
Sorry, government should (IMHO) take charge in those areas where something is in humanity's best interest, but is not yet profitable. Once things are profitable, the gov't can get out of the way. Private industry is too focused on short-term profit to care much about anything else.
The Sun and Moon have significant effects on satellite orbits and I would hope that GPS already accounts for these. I'd give exact numbers, but my copy of B.M.W. is elsewhere -- I recall that it is on the order of 10%.
If they ever come up with a way to turn fine British beer into Budwiser I'll let you know.
It's quite simple: drink the British, and piss into a Bud bottle.
I would think that the parent's statement should be perfectly obvious to any open minded and informed individual.
W's Whitehouse has done more to inflate the power of the Presidency at the expense of both Congress and the Bill of Rights than any president since Nixon. They admit this, and are quite proud of it (although they don't mention Nixon). It's pissing off quite a lot of traditional conservatives, who believe in state's rights and smaller government.
Whatever happened to "uphold and defend the Constitution of the United States."
Examples:
Secrets act
FISA
Unusual definition of "torture"
Mars Global Surveyor had severe structural damage. Nevertheless, I agree that most problems in spacecraft are electronics and software. I'd think that this technology would be more useful in fatigue-prone high performance structures such as aircraft.
And, yes, I am a rocket scientist.
And besides, maybe if they did force everyone to use DRM, it would stop the whole "buy 10,000 email addresses for $10" kind of privacy violations we see rampantly all over the US.
No, it would make such privacy violations worse. DRM is all about _other people_ controlling your computer, and your data. This is compatible with neither privacy, nor security. EFF is a good place to read about this. Cory Doctorow has discussed this in depth as well (an EFF fellow).
I was lucky enough to have Prof Leith teach my optics class at Michigan about 10 years ago. At one point, he took the entire class over to his lab to show his latest work as well as share his outstanding personal holography collection. Still recall the 20"x30" self-portrait he received from a Soviet scientist: amazingly crisp and clear (used Dichromated gelatin rather than film). Always had stories to tell...
When one of your enemies attacks you, you really have to go after them all, innocent or not.
Odd, that's just what Bin Laden says, only he is more eloquent.
America's current fundamentalism is more trajic than Islamic fundamentalism: we have more money, and are supposed to know better.
Try to patent something that the government thinks should be (or is) secret and suddenly you'll find you no longer have any rights to it. Not sure if they are required to pay you, although Feynman eventually did manage to get $1 for the idea of a nuclear submarine...
Uh, just in case people didn't RTFA (I know, this is slashdot), we're not talking about a "loud sound" -- this is a shock wave. Think explosion, and you'll be close.
Essentially what they intend is a accoustic phased-array that allows them to focus the output of all 360 kilowatt (?) class "speakers" into a very small area. Imagine 360,000 watts of stereo sound brought to a focus _inside_ your head.
As for the environmental effects:
One must always consider the sailor's lives, and the diesel etc. But it does deserve some serious thought from someone who is qualified. Note this does not mean a representative from the fishing industry.
You'd think that for what they're charging they'd spring for an Eheim or sumthin
Actually, the Zalman does use an Eheim -- just a crappy one (or one not meant for such hot water).
it's actually more difficult to properly admin a Windows box well
I find 00 buckshot works quite well.
Seriously though, IIS runs really poorly on Linux too. Insist on such combinations and you get what you deserve. Did anyone investigate SAP before spending two weeks trying to get it running? I also find it quite hard to believe that they were getting crashes every week or so. Although I avoid RedHat...
Does the Kernel require copyright assignments like GCC? I'd think this could allow the assignee to change the license etc. Not sure this is the case though: GCC development appears (IMHO) to be much more structured than the Kernel -- for better or worse.
A third party implementation won't help: this decision (IMHO) will just cause more game developers on MS to abandon OpenGL in favor on DirectX. I'd bet some third party OpenGL library would be more trouble than it's worth for most.
Yup, just a variation on embrace, extend, extinguish. So what someone needs to due is sue. Of course that may not work either: although Sun got $900M, Java on MS is still broken unless you download Java yourself.
In a true free market, monopolies don't exist. Only authorities can enforce them. That's where your local government finds the blame.
BZZZT! Wrong. Try taking Econ 101. Thanks for playing.
Wonder how many of these options I'll have available when the regional telco takes over my DSL line?
Zero. Any the infrastructure will be so oversubscribed that your "6mb" service will actually deliver about 40kbps. I know from experience...
Whoever said this regulation was supposed to help anyone other than the duopolists it will create? 'Tis what 51% of the american people voted for in the last election (EPA run by the chemical industry, Interior run by the Mining industry, etc).
markets work better than regulators do.
Bullshit -- only if there is _real_ competition! There is no competition in the local phone and power industries (at least not here). So deregulating these industries does nothing for the consumer other than make them bend over. I can't wait until the same applies to DSL.
Futhermore, a free market only leads to maximization of profits. We need _some_ regulation to enforce other limits that society desires (environmental protection, limit bribery and corruption etc). Those who would argue that the consumer could uphold these "societal limits" via choice have a poor understanding of marketing and human nature.
The problem with DSL, phone, cable, and power is that the infrastructure required to provide these services requires huge capital investments that virtually preclude meaningful competition for all but a few markets with high population densities. And don't forget that an aweful lot of that infrastructure was initially funded by the government.
So you think every other OS has to perfectly emulate Windows, crashes, crap, and all?
God, I hope not. Copying is easy -- vision is hard.
accept it as being Bush's fault
_Nothing_ is Bush's fault. That's the problem.