unless they are bent by a magnetic or electric field or something similar.
you mean like gravity?
Gravitation effects occurring on neutrinos during a 732km trip are pretty much non-existent and wouldn't add 18m. Neutrinos are very weakly interacting particles and to expect them be significantly affected by gravity on a 732km trip is laughable.
they just sent a beam straight from CERN to Gran Sasso right through any intervening rocks.
"straight"??? relative to what? the earth is in constant motion.
you're an idiot.
Relative to the earth. The earth is in constant motion but so are the two sites involved in the experiment and in fact, they are in almost the same motion as each other so yes you can talk about sending things straight between the two sites.
Calling people idiots seems to be your standard m.o., perhaps you should check yourself for the idiocy, first.
considering 732km is a linear distance, it doesn't matter how precisely they measured if they didn't take into account the curvature and motion of the earth, and any gravitational forces.
Linear measurements are what you want. Particle beams travel in straight lines unless they are bent by a magnetic or electric field or something similar. Given that these are neutrinos, they just sent a beam straight from CERN to Gran Sasso right through any intervening rocks.
Not necessarily. The smaller die usually means shorter paths through the chip (less resistance so less heat). Also, you can generally get higher speeds with less voltage (within reason). Less voltage generates less heat. And that's the whole point to smaller die sizes. Faster speeds, less power draw, lower heat generation.
That hasn't been true for a while. Nowadays, reduced sizes mean that the heat generation doesn't go down because the gates and chip features are small enough that voltage leaks through and generates waste heat. Intel and AMD have done a lot to avoid or mitigate this through better materials and different process technologies. However, it's still there since the TDP for processors have basically been stagnant for a while.
You do know there's a large difference between ionizing and non-ionizing radiation right? This stuff is on the wrong side of the spectrum to be causing you such problems.
The absolute worst you might get is some heat from absorption.
You know that just because the radiation doesn't cause damage to the DNA doesn't mean that it won't negatively influence cell growth and division right? Magnetic fields have been shown to influence cell division and growth rates and although the current studies used relatively high magnetic fields, smaller fields or other EM radiation may also have effects on cell growth and health.
Fermilab is not shutting down. The tevatron is but Fermi is actively participating in the CMS detector at the LHC and has a few projects looking at neutrino physics and other things in the intensity frontier.
According to the article, they actually do image the orbitals because they're looking at the interaction of the orbitals of CO and the target orbitals. This way they can calculate phase information and get the actual orbitals themselves instead of just electron density.
I struggled with it, trying to treat it like a science, for a whole year before my professor finally admitted that they don't know exactly how anything works; the core theories are good science, but have little more real-world proof than quantum physics. And succeeding at something novel in applied organic is far more art than science, despite the need for a post-doctoral scientific background..
Are you talking about synthetic organic chemistry or theoretical? I think the theoretical stuff is moderately well understood and is certainly past the mysticism part. Synthetic o-chem OTOH seems to be more about rules of thumbs, guidelines, and art since there's a lot of factors that come into play when synthesizing a novel compound.
BTW, quantum mechanics, especially the standard model, is very well proven and predicts things to extremely high accuracies. We're talking agreements to 10^-8 or better here between theoretical predictions and experiments. If it's lacking real-world proof, then well everything else is simply fairytales in comparison.
Glad I'm sitting on a bunch of gold bought in the 1990's at $400/oz. Made $3 million on paper from it this year. Not touching it though. It's not a rainy day - yet.
That's BS. Gold has increased by around 10% since Jan 2011. Your $3 million paper profit represents $30 million in gold. If you have enough to keep $30 million in gold, you probably don't have any rainy day worries to deal with and you most likely wouldn't be posting on slashdot to begin with.
A lot of this depends on what you're doing with your cluster and what apps you're running. However, Scientific Linux is used by quite a few large clusters and all of the US ATLAS and CMS clusters run on. As others have mentioned, you probably want to be more interested in how the cluster is managed and nodes setup and kept up to date. I'd recommend something like cobbler and puppet or some other change management system so that you can setup profiles and automatically have that propagated to the various nodes automatically. This is preferable and easier than going through and making the same configuration changes on 5-10 machines.
Can you describe one of these magical hardware configurations where a Windows VM host can run, but Linux can't?
The acerpower 2000 mini-systems have this issue. Linux (RHEL 4/5, SL 4/5/6) all install but don't recognize the network card. Windows vista and 7 can use the network card. A modern system without a network connection is pretty much functionally useless nowadays.
It's behind VMWare, but it's a different domain. You get Hyper-V "free" with Win2k8. It's very useful in moderate VM deployments, and even in some large scale scenarios. But yeah, VMWare has a much broader solution to higher end needs.
Xen/KVM/etc...? Umm, no. Those are small time. In a crowd of Unix people in little piddly environments running shit on 20 servers you may find people using some of these, but large scale uses are few and far between.
In the scientific and research communities, Xen/KVM deployments are fairly present. Right now, Nimbus running on future grid runs VMs on 4 different clusters with a total of about 800 cores available. Future grid itself has about 5000 cores available and provides a variety of IaaS and VM/cloud services. There's a few other places running moderately large installs using linux based virtualization solutions. It might not quite reach the scale of Amazon/Google/etc. but they're definitely up there in terms of # of systems.
What happened to the 3rd generation SSDs that Intel was supposed to release this month? They were supposed to be using 25nm flash and offer roughly twice the space for the same price as the G2 drives. Using a new controller and upgrading things a bit seems a poor substitute for that.
If you don't know how to use root access in a way that doesn't screw up your box, you don't deserve to have a job as an admin, period. Its not like its easy to bumble around on a command line and screw something up. There's really only one really easy thing to do that will potentially demolish a box and that's rm -rf * in the wrong directory and it is a rare sudoers file indeed that prevents a sysadmin from running 'rm'.
Uh huh. Okay. How about this?
rm -rf ./
Normal user: "Oh shit access denied, ctrl-c ctrl-c"
Root: "Huh, why is this delete taking so long?"
Don't forget the ever popular chown -R foo:bar . in the wrong directory.
And also except for the fact that they don't pay taxes (and never will), have to steal someone else's Social Security number to get a job / go to college, etc.
Most undocumented pay taxes but never file tax returns to get refunds or claim social security benefits/unemployment/etc. The net effect is to pay much more in taxes than services that they used. If you think about it, you contradict yourself in your statement. If someone is using someone else's social security number to get a job then FICA/social security/payroll and other state and federal taxes are being paid. Of course, the person won't ever try to claim the benefits to avoid being caught.
None of the statements in that article are backed up and based on how he seems to think tertiary butylhydroquinone is some from of lighter fluid (butane), I'd say that the author doesn't know what he's talking about. Saying tertiary butyl (t-butyl) is like n-btuane is similar to saying the nvram for holding bios images is like ddr ram. It's sort of in the same class but the structure and properties of each is radically different.
We already know what the star is like. It's about on par with the Sun so the planet is probably molten on one side and fairly cold on the other given that it's probably tidally locked.
The comparison isn't very apt or fair. Israel has a single airport to protect, the US has something on the order of 100. Add in the fact that unless you're an Israeli Jew or part of an established, organized tour group, you can expect a 3-4 hour wait and it quickly becomes infeasible to do something similar in the US without making air travel a very painful process. There's things the Israelis do that probably should be adopted in the US, such as having the secure, bomb resistant areas for checked luggage and interviewing areas so that potential alarms don't result in the evacuation of the entire terminal. However, I don't think turning a flight into a 3-4 hour ordeal to board for anyone that isn't white and christian is going to fly in the US.
Whoever came up with the code that DNA uses, needed only four letters. The wide variety of living things that depend on this simple code shows that four letters is enough to express all that incredible complexity.
Thus, a keyboard with four letters should be enough, shouldn't it?
Not true, RNA has uracil and there's epigenetics. Among other things, methylation of the genome and modifications to the histones encode information on what genes are activated and how they get expressed. It turns out that the DNA base pairs are just the beginning of how genes get encoded and expressed.
The languages we know affect what thoughts we can think. While it is very zen to say that words hide meaning, empirical evidence seems to indicate that we cannot conceive of ideas that we do not have language to express. Math can express most anything which allows for thoughts right up to the limits of our hardware. It seems like this is also a good reason to learn a human language with different roots than your native one, but I have not done that yet, so I couldn't say.
Not really, the strong formulation of the Sapir-Whorf hypothesis has been shown to be incorrect. There's an argument about whether the weak form which suggests that language might influence thought and behaviour is accurate. However, the weak form doesn't support your assertion at all.
Also, saying that math can express most anything is a pretty strong assertion. I'd say that it's currently manifestly untrue for things like expressing emotion content. It's also not very good at expressing and formulating statements in things like epistemology and ontology. Even in the sciences, math doesn't do a very good job in expressing biological knowledge and constructs or even things in chemistry.
Asking out of sheer ignorance: can't you just embed the thing in a chunk of lead?
You could but it's incredibly expensive to send up heavy things and adding shielding increases weight significantly. Also, dense shielding (e.g. lead) can make the problem worse. Depending on the type of radiation, you may get a shower of particles instead of a single particle as the radiation interacts with the shielding.
A single high energy particle or photon, could quite possibly go through the chip without interacting or doing anything. However, with shielding, there's a greater chance of interactions happening between the shielding material and the incoming radiation. This could cause the atoms to split or knock electrons out of their orbits. In addition, the interaction may result in new unstable particles to form due to the energies involved. So instead of a single high energy particle hitting your chip, you may suddenly get a hundred low energy particles hitting your chip and system.
If, for example, medical interns had a union to prevent 16-hour shifts, I imagine we could agree that to be a step forward.
And then what happens if the medical union didn't get what it wanted at the bargaining table? Ooops sorry no medical attention for you, they're on strike.
Do you really want someone that's puts in 100+ hours a week and who's at the end of a 16 or 20 hour work shift trying to diagnose you and giving you potentially lethal drugs? Or even better, cutting you open in order to fix something?
Patel said. "Most systems are designed thinking the battery will last less than a year. Now the device sold can have the battery integrated and frenetically sealed. "
I'd like to see one of those frenetically sealed batteries. Or maybe just see a video of the battery being sealed.
Seriously? I patched 5500 linux servers in 24 hours *by myself*, all the while they were churning through collider data from the LHC. This would be, in my opinion, what I would call a production environment. Shortcuts are nice, but sometimes you don't need them if your environment is engineered properly.
That's slightly different. I assume you're at a CMS or ATLAS T2 center and frankly most of those systems were worker nodes that could be taken down for a minute or too for a reboot as jobs were drained off of them and they went idle. A quick reboot and they'll show up in condor or pbs a minute or two later and start processing jobs. The gatekeepers and gateways for the SE would be more complicated but if you got them up within a minute or two, most if not all of the running jobs wouldn't notice.
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unless they are bent by a magnetic or electric field or something similar.
you mean like gravity?
Gravitation effects occurring on neutrinos during a 732km trip are pretty much non-existent and wouldn't add 18m. Neutrinos are very weakly interacting particles and to expect them be significantly affected by gravity on a 732km trip is laughable.
they just sent a beam straight from CERN to Gran Sasso right through any intervening rocks.
"straight"??? relative to what? the earth is in constant motion.
you're an idiot.
Relative to the earth. The earth is in constant motion but so are the two sites involved in the experiment and in fact, they are in almost the same motion as each other so yes you can talk about sending things straight between the two sites.
Calling people idiots seems to be your standard m.o., perhaps you should check yourself for the idiocy, first.
How precisely did they measure the 732km?
considering 732km is a linear distance, it doesn't matter how precisely they measured if they didn't take into account the curvature and motion of the earth, and any gravitational forces.
Linear measurements are what you want. Particle beams travel in straight lines unless they are bent by a magnetic or electric field or something similar. Given that these are neutrinos, they just sent a beam straight from CERN to Gran Sasso right through any intervening rocks.
Not necessarily. The smaller die usually means shorter paths through the chip (less resistance so less heat). Also, you can generally get higher speeds with less voltage (within reason). Less voltage generates less heat. And that's the whole point to smaller die sizes. Faster speeds, less power draw, lower heat generation.
That hasn't been true for a while. Nowadays, reduced sizes mean that the heat generation doesn't go down because the gates and chip features are small enough that voltage leaks through and generates waste heat. Intel and AMD have done a lot to avoid or mitigate this through better materials and different process technologies. However, it's still there since the TDP for processors have basically been stagnant for a while.
You do know there's a large difference between ionizing and non-ionizing radiation right? This stuff is on the wrong side of the spectrum to be causing you such problems.
The absolute worst you might get is some heat from absorption.
You know that just because the radiation doesn't cause damage to the DNA doesn't mean that it won't negatively influence cell growth and division right? Magnetic fields have been shown to influence cell division and growth rates and although the current studies used relatively high magnetic fields, smaller fields or other EM radiation may also have effects on cell growth and health.
Fermilab is not shutting down. The tevatron is but Fermi is actively participating in the CMS detector at the LHC and has a few projects looking at neutrino physics and other things in the intensity frontier.
According to the article, they actually do image the orbitals because they're looking at the interaction of the orbitals of CO and the target orbitals. This way they can calculate phase information and get the actual orbitals themselves instead of just electron density.
I struggled with it, trying to treat it like a science, for a whole year before my professor finally admitted that they don't know exactly how anything works; the core theories are good science, but have little more real-world proof than quantum physics. And succeeding at something novel in applied organic is far more art than science, despite the need for a post-doctoral scientific background. .
Are you talking about synthetic organic chemistry or theoretical? I think the theoretical stuff is moderately well understood and is certainly past the mysticism part. Synthetic o-chem OTOH seems to be more about rules of thumbs, guidelines, and art since there's a lot of factors that come into play when synthesizing a novel compound.
BTW, quantum mechanics, especially the standard model, is very well proven and predicts things to extremely high accuracies. We're talking agreements to 10^-8 or better here between theoretical predictions and experiments. If it's lacking real-world proof, then well everything else is simply fairytales in comparison.
Glad I'm sitting on a bunch of gold bought in the 1990's at $400/oz. Made $3 million on paper from it this year. Not touching it though. It's not a rainy day - yet.
That's BS. Gold has increased by around 10% since Jan 2011. Your $3 million paper profit represents $30 million in gold. If you have enough to keep $30 million in gold, you probably don't have any rainy day worries to deal with and you most likely wouldn't be posting on slashdot to begin with.
At first I thought they were talking about left/right tilting for fast cornering... Now THAT would be hard to replicate on a stationary bike.
Not really, kurt kinetic's rock and roll trainer already lets you do that in part.
A lot of this depends on what you're doing with your cluster and what apps you're running. However, Scientific Linux is used by quite a few large clusters and all of the US ATLAS and CMS clusters run on. As others have mentioned, you probably want to be more interested in how the cluster is managed and nodes setup and kept up to date. I'd recommend something like cobbler and puppet or some other change management system so that you can setup profiles and automatically have that propagated to the various nodes automatically. This is preferable and easier than going through and making the same configuration changes on 5-10 machines.
Can you describe one of these magical hardware configurations where a Windows VM host can run, but Linux can't?
The acerpower 2000 mini-systems have this issue. Linux (RHEL 4/5, SL 4/5/6) all install but don't recognize the network card. Windows vista and 7 can use the network card. A modern system without a network connection is pretty much functionally useless nowadays.
It's behind VMWare, but it's a different domain. You get Hyper-V "free" with Win2k8. It's very useful in moderate VM deployments, and even in some large scale scenarios. But yeah, VMWare has a much broader solution to higher end needs.
Xen/KVM/etc...? Umm, no. Those are small time. In a crowd of Unix people in little piddly environments running shit on 20 servers you may find people using some of these, but large scale uses are few and far between.
In the scientific and research communities, Xen/KVM deployments are fairly present. Right now, Nimbus running on future grid runs VMs on 4 different clusters with a total of about 800 cores available. Future grid itself has about 5000 cores available and provides a variety of IaaS and VM/cloud services. There's a few other places running moderately large installs using linux based virtualization solutions. It might not quite reach the scale of Amazon/Google/etc. but they're definitely up there in terms of # of systems.
What happened to the 3rd generation SSDs that Intel was supposed to release this month? They were supposed to be using 25nm flash and offer roughly twice the space for the same price as the G2 drives. Using a new controller and upgrading things a bit seems a poor substitute for that.
Uh huh. Okay. How about this?
rm -rf . /
Normal user: "Oh shit access denied, ctrl-c ctrl-c"
Root: "Huh, why is this delete taking so long?"
Don't forget the ever popular chown -R foo:bar . in the wrong directory.
And also except for the fact that they don't pay taxes (and never will), have to steal someone else's Social Security number to get a job / go to college, etc.
Most undocumented pay taxes but never file tax returns to get refunds or claim social security benefits/unemployment/etc. The net effect is to pay much more in taxes than services that they used. If you think about it, you contradict yourself in your statement. If someone is using someone else's social security number to get a job then FICA/social security/payroll and other state and federal taxes are being paid. Of course, the person won't ever try to claim the benefits to avoid being caught.
None of the statements in that article are backed up and based on how he seems to think tertiary butylhydroquinone is some from of lighter fluid (butane), I'd say that the author doesn't know what he's talking about. Saying tertiary butyl (t-butyl) is like n-btuane is similar to saying the nvram for holding bios images is like ddr ram. It's sort of in the same class but the structure and properties of each is radically different.
What if it's a really weak sun?
We already know what the star is like. It's about on par with the Sun so the planet is probably molten on one side and fairly cold on the other given that it's probably tidally locked .
The comparison isn't very apt or fair. Israel has a single airport to protect, the US has something on the order of 100. Add in the fact that unless you're an Israeli Jew or part of an established, organized tour group, you can expect a 3-4 hour wait and it quickly becomes infeasible to do something similar in the US without making air travel a very painful process. There's things the Israelis do that probably should be adopted in the US, such as having the secure, bomb resistant areas for checked luggage and interviewing areas so that potential alarms don't result in the evacuation of the entire terminal. However, I don't think turning a flight into a 3-4 hour ordeal to board for anyone that isn't white and christian is going to fly in the US.
Sure ornithopters are great, but what I really want is a personal submarine that looks like a shark, or perhaps a subway train that drills its own tunnels, like a worm.
That sub can't actually submerge. It looks like the intake and exhaust still need to be in the air for it to work.
Whoever came up with the code that DNA uses, needed only four letters. The wide variety of living things that depend on this simple code shows that four letters is enough to express all that incredible complexity.
Thus, a keyboard with four letters should be enough, shouldn't it?
Not true, RNA has uracil and there's epigenetics. Among other things, methylation of the genome and modifications to the histones encode information on what genes are activated and how they get expressed. It turns out that the DNA base pairs are just the beginning of how genes get encoded and expressed.
The languages we know affect what thoughts we can think. While it is very zen to say that words hide meaning, empirical evidence seems to indicate that we cannot conceive of ideas that we do not have language to express. Math can express most anything which allows for thoughts right up to the limits of our hardware. It seems like this is also a good reason to learn a human language with different roots than your native one, but I have not done that yet, so I couldn't say.
Not really, the strong formulation of the Sapir-Whorf hypothesis has been shown to be incorrect. There's an argument about whether the weak form which suggests that language might influence thought and behaviour is accurate. However, the weak form doesn't support your assertion at all.
Also, saying that math can express most anything is a pretty strong assertion. I'd say that it's currently manifestly untrue for things like expressing emotion content. It's also not very good at expressing and formulating statements in things like epistemology and ontology. Even in the sciences, math doesn't do a very good job in expressing biological knowledge and constructs or even things in chemistry.
Asking out of sheer ignorance: can't you just embed the thing in a chunk of lead?
You could but it's incredibly expensive to send up heavy things and adding shielding increases weight significantly. Also, dense shielding (e.g. lead) can make the problem worse. Depending on the type of radiation, you may get a shower of particles instead of a single particle as the radiation interacts with the shielding.
A single high energy particle or photon, could quite possibly go through the chip without interacting or doing anything. However, with shielding, there's a greater chance of interactions happening between the shielding material and the incoming radiation. This could cause the atoms to split or knock electrons out of their orbits. In addition, the interaction may result in new unstable particles to form due to the energies involved. So instead of a single high energy particle hitting your chip, you may suddenly get a hundred low energy particles hitting your chip and system.
And then what happens if the medical union didn't get what it wanted at the bargaining table? Ooops sorry no medical attention for you, they're on strike.
Do you really want someone that's puts in 100+ hours a week and who's at the end of a 16 or 20 hour work shift trying to diagnose you and giving you potentially lethal drugs? Or even better, cutting you open in order to fix something?
I'd like to see one of those frenetically sealed batteries. Or maybe just see a video of the battery being sealed.
Seriously? I patched 5500 linux servers in 24 hours *by myself*, all the while they were churning through collider data from the LHC. This would be, in my opinion, what I would call a production environment. Shortcuts are nice, but sometimes you don't need them if your environment is engineered properly.
That's slightly different. I assume you're at a CMS or ATLAS T2 center and frankly most of those systems were worker nodes that could be taken down for a minute or too for a reboot as jobs were drained off of them and they went idle. A quick reboot and they'll show up in condor or pbs a minute or two later and start processing jobs. The gatekeepers and gateways for the SE would be more complicated but if you got them up within a minute or two, most if not all of the running jobs wouldn't notice.