I've seen them compress random data streams to 1/25th (even 1/30th!!) their size. I've seen it too, it really works. And they can even put that into a self-extracting executable!!
Well, this and - a former minister of the interior, well known for being a 'law and order man' managing black money - *secret contracts* about sums in the range of 1e8 EUR for the totally overengineered satellite-based road toll system
etc. show me how far very serious corruption crept into the government of my country...
I share your sentiment, but I'm also very afraid that 'trusted' computing, DRM and especially software patents will still drive a lot of motivated, altruistic people out of the FOSS scene.
From the POV of the big. corps., this needs to be fast enough to avoid creating a powerful opposition - they're probably trying to tune the TCPA market introduction etc. to avoid this and bully the FOSS crowd until it vanishes => problem solved and another industry which is finally 100% 'professional'.
I'm just curious... this seems to be somewhat similar to the situation with the data from european airlines... does the US government get the search history of foreigners, too?
[[The energy translates into heat, are you saying that a bullet hitting a metal plate doesn't translate some of that kinetic energy into heat?]]
It does, but that energy wasn't heat BEFORE the bullet hit the target. If an object being in motion was equivalent to heat, then the temperature of objects would depend on their relative velocities to us. That is clearly an absurd concept.
Well, you can very well define the energy of the movement of the bullet and the target relative to each other as the 'heat' of the bullet-target system. Normally, noone does this as ballistics go into more detail than thermodynamic state equations.
Of course, you should be careful not to confuse inherent the temperature of the bullet (the movement of the lead atoms relative to each other) with the kinetic properties of the bullets, their heat, which produces a more-or-less well defined temperature after thermalization occurs (the bullet hits the target).
Nor should you confuse temperature and heat at all, which are, although very closely related, not the same things!
[[Speedy particles smashing into each other have a lot of kinetic energy in the center of mass inertial system. This is nothing different than 'heat'.]]
Wrong. Heat is random motion.
Well, the 'smashing' part I explicitely stated accounts for the thermalization.
If simple kinetic energy was all it took to have heat, then any gas cloud out in space with a large velocity relative to us would be extremely "hot." But we all know intuitively that things do not change temperature just because they speed up. The air in a moving car is not hotter than the air in a parked car. Heat is the random motion of particles with respect to each other. No, not 'respect to each other', in respect to the center of mass, as I wrote. Heat is the average kinetic energy of particles (in classical statistical mechanics).
The collision of a few particles doesn't qualify. And why not? Care to explain?
When gas quickly depressurizes, it cools down. Ever wonder why? It's because as the gas escapes, the particles which are near each other tend to all move in the same direction (outward) and thus their random motions with respect to each other are decreased. Thus, the temperature drops. Yes, the temperature drops. But the gas still carries the same amount of heat (transportation by photons excluded). Smash two nuclei, they interact, a hot ball of reaction products results and cools down as the particles move away from each other according to a law similar to pV=NRT. The temperature drops, the amount of heat in this ensemble of molecules/atoms/particles stays the same.
Or consider how a rocket nozzle works by focusing the molecular motions in a particular direction (by forcing the gas through a small opening to increase the pressure and then into a cone to suddenly decrease it), thereby converting the high pressure and heat of the exhaust gas into directed kinetic energy. What do you want to say with this paragraph?
Learn more before making these kinds of proclamations. Sigh. Bold and derogatory statements like this activate/.'s groupthink and your post gets moderated higher than mine. ("He's louder so he knows better...") I infer from your arrogance that you probably have a PhD in theoretical physics - but you should've learned some communication skills, too:-)
Although the device as a whole may be at room temperature, the region where the fusion reactions occur is at a much higher temperature (10^6K or similar) - as it is needed for fusion.
Speedy particles smashing into each other have a lot of kinetic energy in the center of mass inertial system. This is nothing different than 'heat'.
Check: it takes about 1 minute for my 700 watt microwave to cook 1 egg. 700 watt-minutes is 42,000 joules. 720 joules Admit it! You ran away into the basement and your mother cleaned up the kitchen.
I love Opera. I've got Opera set to warn me about cookies with "incorrect paths", I've been getting alot of warnings about cookies lately. (which I obviously refuse when they come up) But if you obviously refuse them, you could as well disable the warning!:)
I can only agree with this. The most important finding of this Mr. Heim seems to be a formula to derive the masses of all elementary particles. I n the various (crackpot) sources on the net, it is alleged that this formula has been numerically evaluated with a computer program at CERN, yielding the exact masses.
Now, there is NO paper or source code available which does this. Hermetism, no thank you, this is the strongest indicator that its simply bunk.
This of course also means that in order to survive, a human being more than ever needs to be rational, sharp thinking and not obfuscating anything - IN THE LONG RUN. So in the end, you are better off if you stop clinging to your cherished believes just because it's easier to accept. That's why brains evolved in the end - it is evolutionary more favorably to be able to THINK. Some of us are better - they stay in the gene pool, some of us less so. And in the end this also means we become educated enough to abandon believes that are just comfortable because they do not trouble us.
'Staying in the gene pool' only depends on reproducing successfully. Bacteria are good at it, and many humans are, too.
You'll find many people with a more developed ability to think here on slashdot (at least it seems so). But this does not mean the/. population will reproduce in THE LONG RUN, certain conditions have to be fulfilled for reproduction;-)
Evolution is one big experiment of nature. Maybe the bacterial species are 'the fittest' and humans are only a short-term 'error'. Who knows?
The fact that it gets cold at night (no sunlight!) should convince you that that the timescale is much smaller here.
Plus, since the rate of heat dissipation is proportional to the heat difference,
You're thinking 'conduction'. Radiative transport goes with T^4. Additionally, you have a nearly perfect heat sink at only a few K temperature (space). Look up Stefan-Boltzmann law.
The rest of your argumentation is invalidated by this.
You'd also be talking about cosmic levels of heat here, because said "staggering amounts of energy" can't just disappear. Assuming you're talking about moving bits of the Moon to Earth (and not just flinging it uselessly into space) since the Earth is lower in a gravity well, all the mass will pick up the difference in gravitational potential between the Earth and the Moon, 100% in heat (since it won't move on the surface of the Earth, at least not for long).
No. The energy WILL disappear. Do not forget radiated heat. We won't send all the mass down at once, of course!
Or are you think the global warming is driven directly by the heat released when burning fossil fuels??
Anyway, back to topic, this is - as already said - of course only transparent propaganda without any working fusion plant.
Ahh, but, maybe,... well we already HAVE a plan for working fusion power plant! Just ignite hydrogen bombs in the upper atmosphere and capture the emitted light with solar cells on the ground. Yay, working fusion power;-)
And then, thought it a step further: Why not just to remove Tron's family name from the article in question? Yes, but as I understand it, the article is not served from germany so the court can't make an order to change it (of course, everyone from the court could change the article, but that is another issue:) - so they are going to wikipedia.de and wikipedia.de has to comply...
It seems that the technical/natural way of thinking here is wrong, as it is about silly compliance with laws. Not to say that I want to be the parents of this guy and be linked to cyberterrorism all the time. But the name is on the net and there is nothing short of monitoring and filtering all transnational fibers in germany to stop this - and this reminds me of not-so-nice countries...
It more of a side-effect of the german justice system that you're experiencing here. There are "act quickly" court orders that you need to obey, until the real case is being discussed in court.
But I don't understand why they are blocking the whole site/redirector wikipedia.de. Wouldn't it be enough to just block the article in question?
This seems to be either a clueless court or wikipedia.de trying to get some media attention on this censorship issue.
All the user has to do is leave both computers on all the time. Every place I've ever worked has left ALL machines on all the time.
[...]
VMWare images are easy to deal with. They look just like the other machines on the network, although perhaps not always running. You don't have to do anything special to support them; they just work. You can think of them like laptops. It's a total non-issue.
I don't want to argue about whether dual boot is harmful and bad to manage, but aren't you contradicting yourself here?
I mean... if a vmware image appears as a second machine which is only sometimes online, what about giving your dual box two IPs, one for each OS and then you have the appearance of 'two boxes sometimes online'? To the IT guy, it should be exactly the same thing. Or are we talking about cross-infection about partitions? [I don't consider this impossible and it isn't, but I never heard of such a (not made up) case.] What am I missing here?
A brute attack is trivial here. There are 2^32 IP addresses so building a complete inverse mapping for this data can be done on an ordinary PC in no time.
This means that each letter is about 2.54 millimeters in length. Hey, you have admitted the true power of the Imperial System here, it's 0.1 inches!
Disclaimer: I'm a EU citizen:)
Re:Here's what's really going on:
on
RFID Cookware
·
· Score: 1
They're talking about inductive heating, which is a bit worrisome: It involves having a kilowatt or so of 13.56 MHz radio frequency energy beamin up at the cooking implement.
The pot can't be just any pot-- it has to hit a certain electromagnetic sweet spot, as to absorb the radio waves, and not reflect them all over the place.
This usually implies it has to be made of somewhat resistive and lossy material-- iron is a good choice.
No, Although 13.56 MHz is an RF ISM band and used for various purposes (such as RF heating, which completely different to induction heating, as RF heating relies on dielectric losses in the material), it would be foolish to use such a high frequency for an induction stove.
Such stoves use a magnetic field switching in the 10s to 100s of kHz range, and essentially form one half of a transformer in a SMPS (switch mode power supply). Using radio frequencies simply does not make sense here, as the conversion efficiency is poor and the pots are not 13.56MHz antennas.
Regarding the material to use for the stove, the stove can be idealized to form such a schematic:
MAINS-> +--------+-R'->--W . W------+
| DRIVER | . . . W . W . ..|
| . . ..| . . . W . W . ..R
| CIRCUIT| . . . W . W . ..| MAINS-> +--------+---->--W . W------+
where the left (1) is the primary coil in the the stove driven by an appropiate driver circuit with unavoidable internal resistance R'. The base of a pot forms the right (2) winding and the material's resistance is R'(idealized). The best conversion efficiency of this setup depends (among other things) on the impedance matching for the R/R' values and the coil windings. It also depends on the magnetic properties of the pot (\mu_r - where's slashdots TeX-Mode?). (Calculation of coil-resistance relationships left as an exercise to the reader, I'm tired;)
Although the oven may be tuned to work with iron pots of certain shape, it could in principle also work with very well conducting silver pots.
I would not be suprised (although this is pure speculation) if the vendors of induction stoves already have methods integrated into the stove (change of frequencies, different tappings switchable on the primary coil etc.) which will try to find the parameters for maximum efficiency energy transfer.
--- This comment was compressed too much because it contains the drawing above. Argh. Hopefully, this text will reduce the compression ratio as needed. Hey, random bits are incompressible: fdhz49b8xgh32gfh43hxhjgfn32nsjkqgk6901dhvnmahjwuht nvnyu324kgdj
If I tell all my friends to drive up and down mainstreet a thousand times a day to wear down the pavement, have I committed a felony?
Instead of bad analogies, how about a little reality for those over-important IT folks, huh?
The school 'suffered' more hits and a 'clogged' line to the ISP, partly because of the guy's action and the slashdotting following. First, the/.ing probably amounts to more than 100x the traffic he and his friends produced - so the school made the situation much worse than it would be. Second, what exactly is the physical damage here? Only a little more waste heat has been produced by the routers and computers involved in this. Maybe the amount of energy the food in my fridge releases when burned. WOW.
Slashdot Mirror
I've seen them compress random data streams to 1/25th (even 1/30th!!) their size.
/dev/urandom >$0
I've seen it too, it really works. And they can even put that into a self-extracting executable!!
#!/bin/sh
cat
Excellent work, digging this up! You made my day.
So a wife, but that implies no life...
Well, this and
- a former minister of the interior, well known for being a 'law and order man' managing black money
- *secret contracts* about sums in the range of 1e8 EUR for the totally overengineered satellite-based road toll system
etc. show me how far very serious corruption crept into the government of my country...
I share your sentiment, but I'm also very afraid that 'trusted' computing, DRM and especially software patents will still drive a lot of motivated, altruistic people out of the FOSS scene.
From the POV of the big. corps., this needs to be fast enough to avoid creating a powerful opposition - they're probably trying to tune the TCPA market introduction etc. to avoid this and bully the FOSS crowd until it vanishes => problem solved and another industry which is finally 100% 'professional'.
I'm just curious... this seems to be somewhat similar to the situation with the data from european airlines... does the US government get the search history of foreigners, too?
[[The energy translates into heat, are you saying that a bullet hitting a metal plate doesn't translate some of that kinetic energy into heat?]]
It does, but that energy wasn't heat BEFORE the bullet hit the target. If an object being in motion was equivalent to heat, then the temperature of objects would depend on their relative velocities to us. That is clearly an absurd concept.
Well, you can very well define the energy of the movement of the bullet and the target relative to each other as the 'heat' of the bullet-target system. Normally, noone does this as ballistics go into more detail than thermodynamic state equations.
Of course, you should be careful not to confuse inherent the temperature of the bullet (the movement of the lead atoms relative to each other) with the kinetic properties of the bullets, their heat, which produces a more-or-less well defined temperature after thermalization occurs (the bullet hits the target).
Nor should you confuse temperature and heat at all, which are, although very closely related, not the same things!
PS. I answered you other post, too.
[[Speedy particles smashing into each other have a lot of kinetic energy in the center of mass inertial system. This is nothing different than 'heat'.]]
/.'s groupthink and your post gets moderated higher than mine. ("He's louder so he knows better...") I infer from your arrogance that you probably have a PhD in theoretical physics - but you should've learned some communication skills, too :-)
Wrong. Heat is random motion.
Well, the 'smashing' part I explicitely stated accounts for the thermalization.
If simple kinetic energy was all it took to have heat, then any gas cloud out in space with a large velocity relative to us would be extremely "hot." But we all know intuitively that things do not change temperature just because they speed up. The air in a moving car is not hotter than the air in a parked car. Heat is the random motion of particles with respect to each other .
No, not 'respect to each other', in respect to the center of mass, as I wrote. Heat is the average kinetic energy of particles (in classical statistical mechanics).
The collision of a few particles doesn't qualify.
And why not? Care to explain?
When gas quickly depressurizes, it cools down. Ever wonder why? It's because as the gas escapes, the particles which are near each other tend to all move in the same direction (outward) and thus their random motions with respect to each other are decreased. Thus, the temperature drops.
Yes, the temperature drops. But the gas still carries the same amount of heat (transportation by photons excluded). Smash two nuclei, they interact, a hot ball of reaction products results and cools down as the particles move away from each other according to a law similar to pV=NRT.
The temperature drops, the amount of heat in this ensemble of molecules/atoms/particles stays the same.
Or consider how a rocket nozzle works by focusing the molecular motions in a particular direction (by forcing the gas through a small opening to increase the pressure and then into a cone to suddenly decrease it), thereby converting the high pressure and heat of the exhaust gas into directed kinetic energy.
What do you want to say with this paragraph?
Learn more before making these kinds of proclamations.
Sigh. Bold and derogatory statements like this activate
Although the device as a whole may be at room temperature, the region where the fusion reactions occur is at a much higher temperature (10^6K or similar) - as it is needed for fusion.
Speedy particles smashing into each other have a lot of kinetic energy in the center of mass inertial system. This is nothing different than 'heat'.
Check: it takes about 1 minute for my 700 watt microwave to cook 1 egg. 700 watt-minutes is 42,000 joules. 720 joules
Admit it! You ran away into the basement and your mother cleaned up the kitchen.
I love Opera. :)
I've got Opera set to warn me about cookies with "incorrect paths", I've been getting alot of warnings about cookies lately. (which I obviously refuse when they come up)
But if you obviously refuse them, you could as well disable the warning!
I can only agree with this. The most important finding of this Mr. Heim seems to be a formula to derive the masses of all elementary particles. I n the various (crackpot) sources on the net, it is alleged that this formula has been numerically evaluated with a computer program at CERN, yielding the exact masses.
Now, there is NO paper or source code available which does this. Hermetism, no thank you, this is the strongest indicator that its simply bunk.
This of course also means that in order to survive, a human being more than ever needs to be rational, sharp thinking and not obfuscating anything - IN THE LONG RUN. So in the end, you are better off if you stop clinging to your cherished believes just because it's easier to accept. That's why brains evolved in the end - it is evolutionary more favorably to be able to THINK. Some of us are better - they stay in the gene pool, some of us less so. And in the end this also means we become educated enough to abandon believes that are just comfortable because they do not trouble us.
/. population will reproduce in THE LONG RUN, certain conditions have to be fulfilled for reproduction ;-)
'Staying in the gene pool' only depends on reproducing successfully. Bacteria are good at it, and many humans are, too.
You'll find many people with a more developed ability to think here on slashdot (at least it seems so). But this does not mean the
Evolution is one big experiment of nature. Maybe the bacterial species are 'the fittest' and humans are only a short-term 'error'. Who knows?
Across what, millions of years?
The fact that it gets cold at night (no sunlight!) should convince you that that the timescale is much smaller here.
Plus, since the rate of heat dissipation is proportional to the heat difference,
You're thinking 'conduction'. Radiative transport goes with T^4. Additionally, you have a nearly perfect heat sink at only a few K temperature (space). Look up Stefan-Boltzmann law.
The rest of your argumentation is invalidated by this.
You'd also be talking about cosmic levels of heat here, because said "staggering amounts of energy" can't just disappear. Assuming you're talking about moving bits of the Moon to Earth (and not just flinging it uselessly into space) since the Earth is lower in a gravity well, all the mass will pick up the difference in gravitational potential between the Earth and the Moon, 100% in heat (since it won't move on the surface of the Earth, at least not for long).
... well we already HAVE a plan for working fusion power plant! ;-)
No. The energy WILL disappear. Do not forget radiated heat. We won't send all the mass down at once, of course!
Or are you think the global warming is driven directly by the heat released when burning fossil fuels??
Anyway, back to topic, this is - as already said - of course only transparent propaganda without any working fusion plant.
Ahh, but, maybe,
Just ignite hydrogen bombs in the upper atmosphere and capture the emitted light with solar cells on the ground. Yay, working fusion power
And then, thought it a step further: Why not just to remove Tron's family name from the article in question? :) - so they are going to wikipedia.de and wikipedia.de has to comply...
Yes, but as I understand it, the article is not served from germany so the court can't make an order to change it (of course, everyone from the court could change the article, but that is another issue
It seems that the technical/natural way of thinking here is wrong, as it is about silly compliance with laws. Not to say that I want to be the parents of this guy and be linked to cyberterrorism all the time. But the name is on the net and there is nothing short of monitoring and filtering all transnational fibers in germany to stop this - and this reminds me of not-so-nice countries...
wikipedia.de redirects to de.wikipedia.org. there is no way to edit/block pages on wikipedia.de without doing the same on de.wikipedia.org.
There is a web server running separately on wikipedia.de. What is the technical problem with selectively filtering the Tron-URL?
It more of a side-effect of the german justice system that you're experiencing here. There are "act quickly" court orders that you need to obey, until the real case is being discussed in court.
But I don't understand why they are blocking the whole site/redirector wikipedia.de. Wouldn't it be enough to just block the article in question?
This seems to be either a clueless court or wikipedia.de trying to get some media attention on this censorship issue.
All the user has to do is leave both computers on all the time. Every place I've ever worked has left ALL machines on all the time.
[...]
VMWare images are easy to deal with. They look just like the other machines on the network, although perhaps not always running. You don't have to do anything special to support them; they just work. You can think of them like laptops. It's a total non-issue.
I don't want to argue about whether dual boot is harmful and bad to manage, but aren't you contradicting yourself here?
I mean... if a vmware image appears as a second machine which is only sometimes online, what about giving your dual box two IPs, one for each OS and then you have the appearance of 'two boxes sometimes online'?
To the IT guy, it should be exactly the same thing. Or are we talking about cross-infection about partitions? [I don't consider this impossible and it isn't, but I never heard of such a (not made up) case.] What am I missing here?
Google could log the MD5 of the IP address
Bad Idea!
A brute attack is trivial here. There are 2^32 IP addresses so building a complete inverse mapping for this data can be done on an ordinary PC in no time.
This means that each letter is about 2.54 millimeters in length.
:)
Hey, you have admitted the true power of the Imperial System here, it's 0.1 inches!
Disclaimer: I'm a EU citizen
The pot can't be just any pot-- it has to hit a certain electromagnetic sweet spot, as to absorb the radio waves, and not reflect them all over the place.
This usually implies it has to be made of somewhat resistive and lossy material-- iron is a good choice.
No, Although 13.56 MHz is an RF ISM band and used for various purposes (such as RF heating, which completely different to induction heating, as RF heating relies on dielectric losses in the material), it would be foolish to use such a high frequency for an induction stove.
Such stoves use a magnetic field switching in the 10s to 100s of kHz range, and essentially form one half of a transformer in a SMPS (switch mode power supply). Using radio frequencies simply does not make sense here, as the conversion efficiency is poor and the pots are not 13.56MHz antennas.
Regarding the material to use for the stove, the stove can be idealized to form such a schematic:
where the left (1) is the primary coil in the the stove driven by an appropiate driver circuit with unavoidable internal resistance R'.
The base of a pot forms the right (2) winding and the material's resistance is R'(idealized).
The best conversion efficiency of this setup depends (among other things) on the impedance matching for the R/R' values and the coil windings. It also depends on the magnetic properties of the pot (\mu_r - where's slashdots TeX-Mode?).
(Calculation of coil-resistance relationships left as an exercise to the reader, I'm tired
Although the oven may be tuned to work with iron pots of certain shape, it could in principle also work with very well conducting silver pots.
I would not be suprised (although this is pure speculation) if the vendors of induction stoves already have methods integrated into the stove (change of frequencies, different tappings switchable on the primary coil etc.) which will try to find the parameters for maximum efficiency energy transfer.
---
This comment was compressed too much because it contains the drawing above. Argh. Hopefully, this text will reduce the compression ratio as needed. Hey, random bits are incompressible: fdhz49b8xgh32gfh43hxhjgfn32nsjkqgk6901dhvnmahjwuh
...deliver up to 120,000 pounds into low Earth orbit
I'm a SI units guy, but isn't a pound about 0.5kg?
According to the Wikipedia entry, it could lift more like 120 tons (metric) to orbit, i.e. the double amount(!)
... then his intent was to crash the school server.
What about 's/crash/make temporarily unavailable/'?
If I tell all my friends to drive up and down mainstreet a thousand times a day to wear down the pavement, have I committed a felony?
/.ing probably amounts to more than 100x the traffic he and his friends produced - so the school made the situation much worse than it would be.
Instead of bad analogies, how about a little reality for those over-important IT folks, huh?
The school 'suffered' more hits and a 'clogged' line to the ISP, partly because of the guy's action and the slashdotting following.
First, the
Second, what exactly is the physical damage here? Only a little more waste heat has been produced by the routers and computers involved in this. Maybe the amount of energy the food in my fridge releases when burned. WOW.