I'm not quite sure where the momentum is being measured (unless it's a colour photographic plate measuring frequency). Do you mean the that at the lens the refraction (depending on the angle of incidence) constitutes a measurement? I'm not so sure it does.
One form of Heisenberg's Uncertainlty principle is that if you're making measurements of both the momentum and position on an object, then the error in your measurements will obey
\delta p * \delta x >= \hbar / 4
But no-one's making measurements of momentum when they're looking through a lens, so \delta x can be made as small as you like.
This predicted future predicts that news publishers, both online and print, will no longer research their own stories but instead refer to stories published on other news sites and papers. This is the model made famous by popular online news site Slashdot where articles almost invariably contain links to Wired, ZDNet, CNN and others. (Jon Katz articles notwithstanding.)
Naturally this brings up the age old problem of the chicken and the egg, and has indeed attracted much attention from cosmologists who deem the puzzle "Central to the essence of every bootstrap theory of the universe."
In the early stages of the automobile, there were hundreds of manufacturers in the US, and lots of unsafe cars. Now there are the Big Three and cars are much safer, but do you think that during the early stages of the industry anyone could possibly have predicted what the automobile would become?
That depends on what you're claiming it has become. If it's that the car would be the primary mode of transport for a large percent of the population in industialised countries, then that's exactly what Henry Ford said it wanted it to become.
IMHO the car is a perfect example of technology gone wrong. In cities it is the dominant mode of transport. People drive to and fro by themselves in cars capable of carrying 5 or more, at about 50 kmh in cars capable of doing 180, and turning a finite resource into pollution at an alarming rate. The car is more bloated than Netscape 6, it is completely unsuitable for the majority of its tasks.
I did see in a newspaper last week some concept cars developed by Peugot and (another manufacturer) - small, fibreglass, two seater and electric. Of course you'd be mad to drive one in case some daydreamer in a 1.5 tonne, 5 litre four wheel drive on their way to the corner store ran over you.
I wish more people *had* thought about what they were doing with the bloody card.
Grover's Algorithm is a method for searching an unstructured list, it offers an improvement from O(n) to (O(sqrt n)) over classical computers.
Shor's algorithm is a quantum algorithm for factoring integers. It is able to do this in O(n^2 log(n) log(log(n)) ) whereas the best classical method for doing so is the number field sieve which takes exp[O(n^1/3 (log n)^2/3] which is pretty impressive.
Breaking DES encryption involves just brute force looking for the keys so a quantum computer would use grover's algorithm here, but breaking RSA (which is probably what your encryption software uses) reduces to the problem of factoring integers and so Shor's algorithm is what has all the white hats worried.
Professor Clark (of said SRC for Quantum Computing) was saying at a talk here at the University of Queensland and said that when discussing this with Intel they showed him one of their prototype coolers which (a) cools to about 4K and (b) fits inside a coke can.
And quantum computers, since adding another qubit doubles the number of possible states they can work with, can keep pace with Moore's Law by adding a qubit every year.:P
Re:quantum security and the new elite
on
Quantum Security
·
· Score: 3
It isn't as bad as all that. According to the article, a quantum codebreaking machine will have to perform a computation of order O(sqrt(n)), where n is the number of possible keys, in order to solve the problem. Classical brute-force searches are, of course, O(n)
This is a quantum method of breaking DES encryption. The method for breaking RSA and other schemes based on factoring being difficult offers an improvement from exp(O(n^1/3 (log n)^2/3)) to 0(n^2 log(n) log(log(n)) ) which is gigantic.
"If computers that you build are quantum,
Then spies everywhere will all want 'em.
Out codes will fail,
And they'll read our email,
Til we get crypto that's quantum and daunt 'em."
(Jennifer and Peter Shor)
I visited some penguin colonies on the Antarctic penisula over christmas 1998. Penguins are often portrayed as awkward and clumsy but seeing them in *that* environment is something else - they swim at about 15-20 knots and are just by far the most widespread of all the creatures down there.
Anyway some of the colonies were about 50000+ birds, just a huge crown of penguins. It was chick hatching season, and all the birds were sitting on their eggs/chicks. When skuas (agressive antarctic bird of prey - huge attitudes) swooped over the colony all the nesting penguins would crouch over their eggs and young like a mexican wave.
I saw one of those shows on the early space race where they had video footage of a guy testing a pressure suit by floating to a height of over 100,000 feet under a balloon. I was watching the footage (camera above the gondala) thinking "How the hell is he planning to get down" when he just jumped. And certainly free fell for a long, long way. So although it probably wasn't 165000 feet then all that stuff about "First time anything like this has been attempted" is bollocks.
These things need to stay in pretty much the same spot - over a city for telecommunication routing and the like. Airships don't head into the wind very well, and large anchor ropes are both impractical and a hazard to other aircraft.
Yeah my celeron 300 at 400 is doing great with 64Mb. Realistically the only cpu and memory trashing things I run are Quake III and Netscape. The rest of the time my box gets used for me to stuff around coding rubbish and use console email and irc. But for some reason I still dream of a dual athlon 850. Weird. And I also think I want a coca-cola, and maybe a new car and...
Spelling, for example, varies between the two different "dialects" of English. We use "Colour" - US people use "Color" etc. (This can be frustrating when you're using a US produced piece of software that refuses to supply a UK English dictionary).
Yeah god damn it! And w3c could at least allow us to write <centre>. Bastards.
Every second faceless corporate website I look at seems to provide next to no contact details for anything other than "Order Enquiries". CRC's website seems to be one of them. The only email even remotely close was orders@crcpress.com so I've sent them off a polite message telling them that I am a both a book nut and a technical person and that I will never buy another one of their books ever if they proceed with this lawsuit.
In the meantime I'm doing my bit through google's cache like has been suggested.
And to top this off optus@home actually actually names your machine on their network (customer id number) so it doesn't make any difference what ip number it has assigned.
I did this too, although can anyone tell me what the hell sunrpc need to have port 111 open for? Actaully, what is sunrpc?
Is closing off ports enough? I have a nagging feeling that in order to have a reasonably secure box I'm going to need to know a little more about ipchains.
Hello? Van Allen Zone? The earth's magnetic field deflects the solar wind and all of it's rather unsavoury energetic particles around the actual planet and atmosphere. Some of the deflected particles spiral down at the magnetic poles and create auroras. The earth's magnetic field does play an important part in keeping us alive.
Slashdot Mirror
Analysing image "pamela_anderson_XXX01.jpg"
......................................
Image type: "Marine Advertising"
Time Taken: 13667 seconds.
3 ATM5-0-0-1.cha9.Brisbane.telstra.net
4 GigabitEthernet3-0.cha-core3.Brisbane.telstra.
5 Pos0-3.ken-core1.Sydney.telstra.net
6 Pos2-3.wel-core3.Perth.telstra.net
7 GigabitEthernet4-0.wel-gw1.Perth.telstra.net
8 Pos1-0.paix1.PaloAlto.telstra.net
9 * paix-f2-5.exodus.net
Perth? What the hell are you doing in Perth? That's the wrong side of the country?
However the dearth of cable and DSL ISPs means that our lighting fast 56.6K modems probably won't notice the difference.
I'm not quite sure where the momentum is being measured (unless it's a colour photographic plate measuring frequency). Do you mean the that at the lens the refraction (depending on the angle of incidence) constitutes a measurement? I'm not so sure it does.
Doesn't the Uncertainty Principle still apply?
One form of Heisenberg's Uncertainlty principle is that if you're making measurements of both the momentum and position on an object, then the error in your measurements will obey
\delta p * \delta x >= \hbar / 4
But no-one's making measurements of momentum when they're looking through a lens, so \delta x can be made as small as you like.
This predicted future predicts that news publishers, both online and print, will no longer research their own stories but instead refer to stories published on other news sites and papers. This is the model made famous by popular online news site Slashdot where articles almost invariably contain links to Wired, ZDNet, CNN and others. (Jon Katz articles notwithstanding.)
Naturally this brings up the age old problem of the chicken and the egg, and has indeed attracted much attention from cosmologists who deem the puzzle "Central to the essence of every bootstrap theory of the universe."
last time i checked "m/s" was "microns per second"
It flipping well is not and never has been. And apart from anything else its micrometer not micron. You can't make a plural out of an adjective.
In the early stages of the automobile, there were hundreds of manufacturers in the US, and lots of unsafe cars. Now there are the Big Three and cars are much safer, but do you think that during the early stages of the industry anyone could possibly have predicted what the automobile would become?
That depends on what you're claiming it has become. If it's that the car would be the primary mode of transport for a large percent of the population in industialised countries, then that's exactly what Henry Ford said it wanted it to become.
IMHO the car is a perfect example of technology gone wrong. In cities it is the dominant mode of transport. People drive to and fro by themselves in cars capable of carrying 5 or more, at about 50 kmh in cars capable of doing 180, and turning a finite resource into pollution at an alarming rate. The car is more bloated than Netscape 6, it is completely unsuitable for the majority of its tasks.
I did see in a newspaper last week some concept cars developed by Peugot and (another manufacturer) - small, fibreglass, two seater and electric. Of course you'd be mad to drive one in case some daydreamer in a 1.5 tonne, 5 litre four wheel drive on their way to the corner store ran over you.
I wish more people *had* thought about what they were doing with the bloody card.
[Disclaimer: I ride a push bike]
The President is ours. We are Americans, and the president is the symbolic American who makes sure that Congress does not over-reach. ...
Am I supposed to be rapping this?
Grover's Algorithm is a method for searching an unstructured list, it offers an improvement from O(n) to (O(sqrt n)) over classical computers.
Shor's algorithm is a quantum algorithm for factoring integers. It is able to do this in O(n^2 log(n) log(log(n)) ) whereas the best classical method for doing so is the number field sieve which takes exp[O(n^1/3 (log n)^2/3] which is pretty impressive.
Breaking DES encryption involves just brute force looking for the keys so a quantum computer would use grover's algorithm here, but breaking RSA (which is probably what your encryption software uses) reduces to the problem of factoring integers and so Shor's algorithm is what has all the white hats worried.
Professor Clark (of said SRC for Quantum Computing) was saying at a talk here at the University of Queensland and said that when discussing this with Intel they showed him one of their prototype coolers which (a) cools to about 4K and (b) fits inside a coke can.
:P
And quantum computers, since adding another qubit doubles the number of possible states they can work with, can keep pace with Moore's Law by adding a qubit every year.
It isn't as bad as all that. According to the article, a quantum codebreaking machine will have to perform a computation of order O(sqrt(n)), where n is the number of possible keys, in order to solve the problem. Classical brute-force searches are, of course, O(n)
This is a quantum method of breaking DES encryption. The method for breaking RSA and other schemes based on factoring being difficult offers an improvement from exp(O(n^1/3 (log n)^2/3)) to 0(n^2 log(n) log(log(n)) ) which is gigantic.
"If computers that you build are quantum,
Then spies everywhere will all want 'em.
Out codes will fail,
And they'll read our email,
Til we get crypto that's quantum and daunt 'em."
(Jennifer and Peter Shor)
I visited some penguin colonies on the Antarctic penisula over christmas 1998. Penguins are often portrayed as awkward and clumsy but seeing them in *that* environment is something else - they swim at about 15-20 knots and are just by far the most widespread of all the creatures down there.
Anyway some of the colonies were about 50000+ birds, just a huge crown of penguins. It was chick hatching season, and all the birds were sitting on their eggs/chicks. When skuas (agressive antarctic bird of prey - huge attitudes) swooped over the colony all the nesting penguins would crouch over their eggs and young like a mexican wave.
They'd probably do the same for planes.
I saw one of those shows on the early space race where they had video footage of a guy testing a pressure suit by floating to a height of over 100,000 feet under a balloon. I was watching the footage (camera above the gondala) thinking "How the hell is he planning to get down" when he just jumped. And certainly free fell for a long, long way. So although it probably wasn't 165000 feet then all that stuff about "First time anything like this has been attempted" is bollocks.
modern airships are quite capable of holding station against 70mph winds
70mph is a gentle breeze for higher altitudes, and besides they would be under solar power.
These things need to stay in pretty much the same spot - over a city for telecommunication routing and the like. Airships don't head into the wind very well, and large anchor ropes are both impractical and a hazard to other aircraft.
Yeah my celeron 300 at 400 is doing great with 64Mb. Realistically the only cpu and memory trashing things I run are Quake III and Netscape. The rest of the time my box gets used for me to stuff around coding rubbish and use console email and irc. But for some reason I still dream of a dual athlon 850. Weird. And I also think I want a coca-cola, and maybe a new car and ...
Spelling, for example, varies between the two different "dialects" of English. We use "Colour" - US people use "Color" etc. (This can be frustrating when you're using a US produced piece of software that refuses to supply a UK English dictionary).
Yeah god damn it! And w3c could at least allow us to write <centre>. Bastards.
Email them anyway.
Every second faceless corporate website I look at seems to provide next to no contact details for anything other than "Order Enquiries". CRC's website seems to be one of them. The only email even remotely close was orders@crcpress.com so I've sent them off a polite message telling them that I am a both a book nut and a technical person and that I will never buy another one of their books ever if they proceed with this lawsuit.
In the meantime I'm doing my bit through google's cache like has been suggested.
And to top this off optus@home actually actually names your machine on their network (customer id number) so it doesn't make any difference what ip number it has assigned.
I did this too, although can anyone tell me what the hell sunrpc need to have port 111 open for? Actaully, what is sunrpc?
Is closing off ports enough? I have a nagging feeling that in order to have a reasonably secure box I'm going to need to know a little more about ipchains.
Optus@home ( an australian cable ISP ) states in their FAQ that
Optus@Home is completely secure if you are using a standard operating system like Windows 98.
I had a good laugh over that one.
You're missing the point. It's about venting frustration.
New Scientist issue: 21 October 2000
PLEASE MENTION NEW SCIENTIST AS THE SOURCE OF THIS STORY AND, IF PUBLISHING ONLINE, PLEASE CARRY A HYPERLINK TO: http://www.newscientist.com
For a 'news' site which rips every single story from elsewhere on the internet you could at least be polite.
Hello? Van Allen Zone? The earth's magnetic field deflects the solar wind and all of it's rather unsavoury energetic particles around the actual planet and atmosphere. Some of the deflected particles spiral down at the magnetic poles and create auroras. The earth's magnetic field does play an important part in keeping us alive.