Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror
×

Comment If robots are everywhere then it's possible (Score 1) 246

Imagine a scenario of several factories that are built by robots. The maintenance of the building is handle by robots too. For example an air conditioning unit breaks down, an oil leak etc etc. There is a robot that comes along to deal with it. The computer that controls these functions monitors it all and responds. The factory has its own robot guards, makes its own weapons etc. It needs more iron ore to make parts? It has a copy of all the maps of geological surveys and sends out a robotically controlled truck and excavator to dig up the ore. It gets the ore and brings it to the robot controlled smelting plant and so on. But this is probably not likely for another few hundred years.

Comment It's hard to see waves unless it reflects (Score 2) 120

This is imagery in the article is really very misleading. What would be more meaningful to set the visible spectrum to black ( so no colour for the buildings) and then set some colours for each individual wifi transmitter. In fact it would look more like an image of Earth from space with only the lights showing, but rather than light it would be a microwave image. It would probably show only the faintest outline of buildings as the RF is absorbed creating an odd looking set of structures. But to 'see' the RF you would also need to set up a kind of 'RF reflective' fog particles in the scene to view the reflections ( a bit like the way you need dust to see a laser beam in the dark)

Submission + - Proof mooted for Heisenberg's uncertainty principle (nature.com)

ananyo writes: Encapsulating the strangeness of quantum mechanics is a single mathematical expression. According to every undergraduate physics textbook, the uncertainty principle states that it is impossible to simultaneously know the exact position and momentum of a subatomic particle — the more precisely one knows the particle’s position at a given moment, the less precisely one can know the value of its momentum. But the original version of the principle, put forward by physicist Werner Heisenberg in 1927, couches quantum indeterminism in a different way — as a fundamental limit to how well a detector can measure quantum properties. Heisenberg offered no direct proof for this version of his principle. Now researchers say they have such a proof. If they're right, it would put the measurement aspect of the uncertainty principle on solid ground — something that researchers had started to question — but it would also suggest that quantum-encrypted messages can be transmitted securely.

Comment Borg technology (Score 2) 464

This is very much like borg technology it seems, though it lacks the green glow. But actually this is a pretty nice prosumer device. I suspect that the entry level machine with 4 cores will be what Apple is keen to sell, I suspect the low end spec machine ( similar to current low spec on the Apple store) but probably a few hundred dollars cheaper. This will allow apple to sell more Apple Displays too. I actually think this is a clever strategy to get people who want to play high end graphics intense games. As far as expandability, I also think those days are over. The daisy chaining ability would reduce the actual number of wires at the back too. Pretty sure there is some kind of tower of Thunderbolt external adapeter drives you can sit next to it. No doubt a third party will create a matching cylinder that you can slide other things into like SDDs graphics cards drives etc and only needing one cable into the main cylinder.

Comment Re:What does this have to do with time? (Score 1) 231

It might be that time is important in the sense that it provides an asymmetry in that there is a direction to time when you observe an energy change. The idea that energy goes somewhere else, decays to somewhere else ( like heat) in a particular time direction. For example at time A energy goes from one level to another , to time point B. The experiment may suggest that under those special conditions time is symmetrical, there is no before or after event or that they can interchange with no energy changes. Just my interpretation here.

Comment Re:Newton? (Score 1) 231

I think the idea is that these atoms would do the equivalent of bob up and down without any external energy input. It's kind of analogous to observing an astronomical object moving in an orbit in the absence of a central massive object. That's how I would interpret it. Because this is happening at a super cooled state you could not extract energy from this system because that would disturb it ( ie Heisenberg's uncertainty principle comes into play). I speculate this effect may occur but it would not have any real large macroscopic relevance.

Submission + - Do 'time crystals' exhibit perpetual motion? (wired.com)

ceview writes: So this story on Wired seems to have got lots of people a bit confused. The experimental set up is incredibly delicate (Bose Einstein Condensate) so it implies this perpetual motion effect can't really be used to extract energy. What is your take on it? It can't really upend anything because at a quantum level things behave weirdly at the best of times.

The heavy details are here
http://arxiv.org/abs/1202.2539v2
http://arxiv.org/abs/1202.2537v2

Submission + - The Amazon rainforest wants its TLD back from Amazon.com (mongabay.com)

terrancem writes: The Seattle-based Amazon.com has applied for its brand to be a generic top-level domain name (.amazon), but South American governments argue this would prevent the use of this internet address for environmental protection, the promotion of indigenous rights and other public interest uses. Along with dozens of other disputed claims to names including ".patagonia" and ".shangrila", the issue cuts to the heart of debates about the purpose and governance of the internet.

Slashdot Top Deals

An authority is a person who can tell you more about something than you really care to know.

Working...