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Physicists Extend Moore's Law For Tiny Devices
Posted by
ScuttleMonkey
on Fri Jul 18, 2008 12:39 PM
from the very-small-advances dept.
from the very-small-advances dept.
schliz writes to mention that a team of quantum physicists have demonstrated how to significantly reduce the effects of "stiction," or the tendency for two very small, very close objects to stick together as a result of Casimir force. "'The Casimir force might be one of the many reasons that very small, movable components in micromechanical devices sometimes stick together,' said Ho Bun Chan, a assistant professor of physics at the University of Florida who is researching the Casimir force. 'The Casimir effect increases rapidly as the separation between components decreases. It becomes significant when the separation is reduced to below about 400 nm,' he told iTnews."
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Let's here it for Zero Point Energy (Score:4, Insightful)
Now if only we could use it as a power source....I would LOVE a ZPM ala Stargate!
Re:Let's here it for Zero Point Energy (Score:5, Interesting)
Zero Point Energy will never yield any significant amounts of energy. It's merely an artifact of the way the Universe is constructed, and not a large source of power or fuel. Stargate attempts to remain (somewhat) scientifically accurate by positing that a micro-universe is contained inside each of the ZPM devices, and that the device attempts to extract all energy from that universe via Zero Point Energy extraction. Thus the ZPMs are capable of "running out" of power once all the energy from the micro-universe is exhausted.
Technically, such an idea suggests that the ZPMs should deliver a constant stream of power at all times. Yet in practice, the ZPMs shown in the program appear to behave more like batteries; often providing more or less power depending upon the city's current requirements. However, this appears to be a literary device as it creates a variety of consistency problems within the program. (e.g. If energy can be extracted at such a rate as to exhaust the unit within a few minutes, why can't the city fly on only one ZPM?)
Parent
Re: (Score:2, Interesting)
It's the difference between voltage and current. The Atlantis stardrive requires at least 10GV to fire, and the output of any given ZPM is rated at a more-or-less-constant 5GV, with DC/DC stepdowns feeding power through the city.
(Or maybe I'm talking utter shit, it's up to you.)
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You're talking shit. They don't have step-up transformers in the Pegasus galaxy? ;-)
Re:Let's here it for Zero Point Energy (Score:5, Funny)
ZPM power production[*] is rated in the non-SI unit "Plot" (analogous to J/s, the second derivative of energy[**], and the first derivative of work[***]).
A ZPM's normal production appears to be approximately 0.1 Plot per episode in which it is portrayed, although in some episodes a ZPM shows how powerful a device it can be, delivering just shy of a full Plot.
The third derivative of energy, "Twist", analogous to J/s^2, can be used to analyse the output of the ZPM over the duration of an episode. In some cases the ZPM provides a substantial Twist, progressing from normal power production to zero or to explosive overload within the span of an Act.
A high-Twist, high-Plot device is consistent with the ZPM as portrayed in Stargate SG-1.
I never got into Stargate Atlantis, sorry.
[*] or production power, which may be more appropriate.
[**] Writer's energy, that is.
[***] Professionally employed TV writer, that is.
Parent
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I could buy that if it weren't for the fact that Rodney completely depleted a ZPM in only a few minutes of operation. (See: McKay and Mrs. Miller [wikia.com]) If the ZPM used capacitors to store a "boost" charge, then he would have been unable to completely deplete the ZPM. Either that, or the ZPM was nearly depleted anyway which means that it was about to become a paperweight anyway.
that explains a lot (Score:5, Funny)
I always wondered why stuff always sticks to one of my sweaters..
Re:that explains a lot (Score:5, Funny)
I always wondered why stuff always sticks to one of my sweaters..
If it's the Casimir effect, you should probably get a bigger sweater.
Parent
Re:that explains a lot (Score:5, Funny)
If it's the Casimir effect, you should probably get a bigger sweater.
I think he was talking about the "cashmere" effect.
Parent
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So he should also stop listening to Led Zeppelin.
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Oh, that thing that Sheldon Cooper can suck on?
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That was because she pulled "this thread". I guess now you're lying on the floor.....undone.
Layne
Didn't we already do this? (Score:3, Interesting)
Or is this different somehow?
Re:Didn't we already do this? (Score:5, Informative)
The earlier work was completely theoretical - the paper in question here is an experimental result.
Why do we care? A lot of reasons - the casimir effect is deeply rooted in quantum physics, but is observable without having to cool things to quantum temperatures. This sort of research is also potentially very important in nanotechnology - if we want our nanosurfaces to not stick, we should make them corrugated - the opposite of the macroworld!
Many times, people have calculated these casimir forces by assuming that the quantum force between two plates by just adding up the forces between particles (pairwise additivity). This is the first (I believe) research that shows this failing experimentally - there are large-scale geometrical effects. This is exciting, as it means that there may be many ways to tune casimir forces, making them do whatever we want - theoretical predictions on piston-like geometries have forces that are attractive at one distance, and repulsive at another!
If anyone's interested, the actual paper is at http://arxiv.org/abs/0805.3776 [arxiv.org] and better summaries (Moore's law wtf?) are at http://www.economist.com/science/displaystory.cfm?story_id=11402849 [economist.com] and http://www.azonano.com/news.asp?newsID=6827 [azonano.com]
Parent
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if we can tune devices to make use of the casmir effect does that make us one step closer to building actual nano machines?
or could such effect be controlled to make even smaller CPU's?
More Info (Score:2, Informative)
Re:More Info (Score:5, Funny)
Just in case.
You know, just in case somoene forgot.
Forgot about wikipedia, I mean.
Because, apparently, looking something up on wikipedia is esoteric enough that a post with a link to wikipedia (and nothin else!) is informative.
Parent
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There's definitely some irony in how you were modded up for giving us the link to help us do something so esoteric as looking up what Wikipedia is. /obvious
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Re:More Info (Score:4, Informative)
Parent
Phew! (Score:4, Funny)
We dodged a real bullet there, I tell ya! I mean, had they not enacted this extension when they did, we would have been stuck. And I mean STUCK with the large devices are forced to use now.
I think Casmir should be taken out behind the tool shed and whipped for his bad behavior.
Moore's Law has nothing to do with this (Score:5, Informative)
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It also has nothing to do with being a law either. It's just a guideline as to what we may expect for the development of microprocessors.
Well, maybe it's a corporate policy^W^W law over at Intel, but as they seem to be keeping on track, we still don't know what to expect for Gordon's Wrath.
sigh... (Score:2, Informative)
Law [reference.com] "A statement describing a relationship observed to be invariable between or among phenomena for all cases in which the specified conditions are met: the law of gravity"
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Moore's "law" was actually a measure of size and cost, not necessarily the number of components.
The initial write-up had time separated plots of cost against component density. Each was roughly parabolic, and the low point of each, which represented the lowest cost transistor density, roughly doubled over each 18-24 months.
A my room mate actually has an Intel t-shirt with a picture of that plot on the fr
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Roughly parabolic on a log-log scale.
http://www.intel.com/technology/mooreslaw/pix/originalgraph.gif [intel.com]
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Excellent point, I'll keep that in mind for the next time this rears it's head.
So few people realize that increasing transistor count without decreasing their size is going to drive up the costs through raw materials while decreasing size alone will drive it up through lower yields and more costly manufacturing processes.
The apparently exponential increase in clock speed we've seen has been more an after effect allowed by the smaller interconnect distances and lower switching voltages that are required at t
*reduced* the surface area? (Score:2)
The author of the article was either confused or isn't explaining things well, because he writes that corrugations reduce the surface area... when the opposite is true... corrugations increase the surface area rather than reduce it. ANyone know whether that was just a typo or he's referring to something subtle that I'm too thick to understand.
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He's probably referring to the contact surface area. By making the surface corrugated, less of the surface comes in close contact to the other surface.
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Re:*reduced* the surface area? (Score:5, Interesting)
Parent
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Ah, and the amount of reduction of force, then, would be effected to the relative orientation of the corrugations.
my car has a casimir-effect engine (Score:2)
Stiction = Old News In HDD (Score:4, Informative)
The stiction effect has been an issue for many years in the disk drive world. The heads in a HDD are planar against a disk that is also a polished planar surface. The net effect is to require amps of current (briefly) when spinning a disk drive up.
After coming up to speed, there is an air bearing between the two, as the head float on a cushion of air. This effect has been an issue in the HDD world for over 30 years.
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Yes, stiction isn't about the Casimir force. :)
Any two very smooth and very planar surfaces will stick together when they come so close that no more air molecules bounce around between them. In vacuum, metals will even weld together at low temperatures. That's a major problem in spaceflight.
Stiction just means that the force to overcome the static friction (sticking together) is way higher than the normal, dynamic friction.
I've seen disk heads ripped off by stiction
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The lubrication issue was in older drives agreed. I am talking drives post 1992 and newer.
IBM had their collection of problems, as well as Quantum (remember them?) -- I don't have to ask in either case, because I was there so to speak. Quantum would not allow us to properly size the power drive chip and there were lots of failures due to the power driver frying. The thing was designed on the edge of failure to save 5 cents, and the designers inside the place (guilty as charged) kept saying that we needed a
Previous Art (Score:3, Insightful)
The solution to freeing a stuck mechanical device is well known.
Hit it.
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and effect which manifests as a creation of force
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I thought those were midichlorians / mitichlorians.....
Layne
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i'm not sure but it isn't a trick of electorstatic forces as it manifests between to non charged (non energetic) plates in a vacume with no pressend electro magnetic field pressend around or between the plates.
Re:Casimir Effect? (Score:5, Informative)
The Casimir effect is very wierd indeed. If you take two metal plates and put them close together in a vacuum they will attract one another VERY weakly. The effect is caused by fluctuations in the electric charge of the vacuum. Think of it a little like sea level. On average if you measure sea level lots of times you wil get "0" for the height but if you measure it just once the height you get will depend on the tide and the size of any waves. The same is true for a vacuum. Look at a particular volume of space and measure the electric charge. On average you will get zero but for a particular moment in time it may be non-zero.
Ok so far but how do we get an attractive force? Well it turns out that charge must be conserved so if one region of space has a small positive charge at one instant a neighbouring area must have a small negative charge (in quantum terms we say that we pair produce and virtual electron-positron pair) thuse we have a dipole. Now remember the two conductors? Well the one nearest the positive charge will have the electrons in the conductor attracted to it and being a conductor they will move towards it giving the conductor a net negative charge. The opposite will happen in the conductor nearest the negative charged area of space.
So now we have, instantaneously, a conductor with a negative charge and one with a positive charge...so they attract one another. this is the Casimir effect. If you stop to think about it is is VERY strange because it means that two metal plates in vacuum, with no externally applied fields will attract...so you have to ask yourself what exactly is doing the work i.e. where is the energy coming from to move these plates?
I'm not a condensed matter guy so I must admit I don't quite understand why this effect is so important to them. I understood that in molecules it was known as Van der Waal forces and due to periodic dipoles occuring in molecules in much the same way it does ina vacuum. Only, because there is a real electric field, the effect is much larger. So if there are any condensed matter people out there perhaps they would like to explain why it is Casimir and not Van der Waals that is important? or is it just because they have the same origin the name Van Der Waals has been dropped?
Parent
Re: (Score:2, Informative)
The Casimir force is the Van der Waals or London's force in bulk, meaning that its the same thing, but studied in relation to conducting surfaces rather than individual molecules. Casimir's original derivation, which is only a couple of pages, makes no reference to quantum vacuum fluctuations, and I think that model and metaphor tends to make the topic seem much more exotic than it really is.
On a side note, there's no way to get free energy out of the Casimir force without using the formula 'stuff-I-don't-
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Can you post a CID link to that? I want to follow it but I can't find it on the userpage you linked to.
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If only there were a way to create some way of making some sort of text that, when clicked, took you directly to the post.
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Ah yes, I can picture it. A brand new generation of crackpots trying to extract infinite energy out of magnets, this time tiinyweenysmall :)