Exxon actually funds a research organization that studies ways of reducing anthropogenic global warming. They would not have that if they didn't know global warming is real.
I heard a talk by an executive at one of Exxon's research branches two years ago. They believe in global warming, and they support cap and trade legislation. They want the government to force all the oil companies to cut carbon emissions. They won't do it until the government takes action because then they could not complete in the marketplace. Exxon already has the carbon sequestration technology they need to continue making money from selling oil after cap and trade happens. It is people who do not want to pay more for oil who are the problem, not the oil companies.
My understanding is that the Helium market is already cornered. This is because Helium extraction was developed for World War II airships. The US government has a strategic reserve, but they are selling it.
But the blimp is for missile defense. What sort of adversary would have missiles but no antiaircraft guns? As for closeness, all sorts of weapons are more easily smuggled on the surface than launched by missiles, so missile defense is pretty futile.
The amount of Helium on the Earth is very small (though there is lots in space). Helium is needed for medical MRIs and scientific research, but we are going to run out in a few decades. My lab is already suffering from increased Helium prices. Helium has a nasty way of escaping from containers (we're only able to recycle about a third of what we use), so these blimps are likely to waste a lot. Just like the rest of the missile defense systems, they'll never be used for their intended purpose.
Chicago has rail in the highway medians. The stations are in the air over a narrow platform. They connect to overpasses. Branches could be in the same place as highway interchanges, and either the highway would need to be elevated briefly. If you put the tracks on the side of the road, leaving a large gap, you have to widen your overpasses a lot. Lots of concrete also prevents accidents.
Livermore uses their Blue Genie/L for mostly the same thing. They are responsible for the country's nuclear technology. The upcoming Blue Genie/P will also do weapons simulations, among other things.
I'm a physics undergraduate and my research is computational, so of course I think programming proficiency is a wonderful thing to have. But many physics students and professional physicists never use it. I've found C++ to be the most useful, though a grasp of at least one common computer algebra system is also necessary. Avoid Maple. Also, many professional physicists have a terrible grasp of computer science. I can tell this even though I'm mostly self taught. Many physicists still think FORTRAN is great. This could be largely an age thing. Probably physics students should just go to the computer science department for electives if they want to learn to program.
My impression from the article was that the merit of the chosen design was a passive train. Making the track passive instead would greatly increase the weight of the train and hence the energy cost of getting up to speed.
I wanted to elaborate on Green's functions. I was working on a problem like this all summer, and Green's functions made it possible. Specifically, I used Weber's theorem to turn the 2D Helmholtz equation into a boundary integral equation. Numerical integration is much simpler to program, and the number of dimensions in my problem was reduced. Head over to the nearest Physics department. They know about Green's functions, if the other mathematicians don't.
I heard a talk by one of the NASA people running the project. He addressed several of the ideas in this thread. His justification for the lack of any dust-removing technology was that the rovers were already at their weight limits.
That is impossible. Any introductory textbook on electrodynamics will tell you that magnetic fields can do no work. There is a simple loophole -- a magnetic field can induce an electric field, which does work.
Americans should know that Cheney is not part of the White House. Number One Observatory Circle is the official residence of the Vice President of the United States, and Cheney rarely goes near Bush so they can't get killed at the same time.\end{pedantry}
I had a book that swore up and down that the oven method was wonderful. The authors claimed to have baked many keyboards with no ill effects. I tried it on one old, cheap keyboard and the plastic warped. No, they didn't say to turn the oven off before putting the keyboard in. The electronics were fine, though.
My bottom-of-the-line Dell B120 laptop runs Debian with the Beryl 3D interface beautifully. This probably says more about the quality of Beryl's optimizations than about Dell hardware. The only thing that doesn't work is the wireless, which I understand doesn't work with Windows either as Dell neglected to include an antenna.
Tip: Use a knoppix disk to install Debian - I can't figure out how to get vanilla debian's sound to work on this laptop.
The reason why homework is better than study hall is that students work at vastly different speeds - and those that work faster are bored (and sometimes will bother those students who are still working) if they are forced to remain in study hall after they are done. It essentially punishes those who perform better.
There is no easy way to improve education, but I feel that the focus should be on increasing the number of teachers, decreasing class size, increasing the number of contact hours for students, and decreasing contact hours for teachers.
More likely this is some particularly odd marketing on the part of jajah. The headline is clearly pro-jajah and the body is unbelievable, prompting people to actually click the link to see if it goes to evidence (I clicked). Seeing as you cannot spell it, I would guess you have not used jajah either.
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I wasn't presupposing anything; I heard an Exxon research executive state that anthropogenic global warming exists.
Exxon actually funds a research organization that studies ways of reducing anthropogenic global warming. They would not have that if they didn't know global warming is real.
I heard a talk by an executive at one of Exxon's research branches two years ago. They believe in global warming, and they support cap and trade legislation. They want the government to force all the oil companies to cut carbon emissions. They won't do it until the government takes action because then they could not complete in the marketplace. Exxon already has the carbon sequestration technology they need to continue making money from selling oil after cap and trade happens. It is people who do not want to pay more for oil who are the problem, not the oil companies.
My understanding is that the Helium market is already cornered. This is because Helium extraction was developed for World War II airships. The US government has a strategic reserve, but they are selling it.
But the blimp is for missile defense. What sort of adversary would have missiles but no antiaircraft guns? As for closeness, all sorts of weapons are more easily smuggled on the surface than launched by missiles, so missile defense is pretty futile.
The amount of Helium on the Earth is very small (though there is lots in space). Helium is needed for medical MRIs and scientific research, but we are going to run out in a few decades. My lab is already suffering from increased Helium prices. Helium has a nasty way of escaping from containers (we're only able to recycle about a third of what we use), so these blimps are likely to waste a lot. Just like the rest of the missile defense systems, they'll never be used for their intended purpose.
Chicago has rail in the highway medians. The stations are in the air over a narrow platform. They connect to overpasses. Branches could be in the same place as highway interchanges, and either the highway would need to be elevated briefly. If you put the tracks on the side of the road, leaving a large gap, you have to widen your overpasses a lot. Lots of concrete also prevents accidents.
Livermore uses their Blue Genie/L for mostly the same thing. They are responsible for the country's nuclear technology. The upcoming Blue Genie/P will also do weapons simulations, among other things.
I'm a physics undergraduate and my research is computational, so of course I think programming proficiency is a wonderful thing to have. But many physics students and professional physicists never use it. I've found C++ to be the most useful, though a grasp of at least one common computer algebra system is also necessary. Avoid Maple. Also, many professional physicists have a terrible grasp of computer science. I can tell this even though I'm mostly self taught. Many physicists still think FORTRAN is great. This could be largely an age thing. Probably physics students should just go to the computer science department for electives if they want to learn to program.
Citation
A satellite that is black in visible light will still show up on a radar.
My impression from the article was that the merit of the chosen design was a passive train. Making the track passive instead would greatly increase the weight of the train and hence the energy cost of getting up to speed.
That's true, this is a much more obscure theorem. See
Weber, Mathematische Annalen 1 (1869), 1-36.
Baker and Copson, The Mathematical Theory of Huygens' Principle, 1939
Shaw, An Integral Equation Approach to Acoustic Radiation, Topics in Ocean Engineering, 1970
I wanted to elaborate on Green's functions. I was working on a problem like this all summer, and Green's functions made it possible. Specifically, I used Weber's theorem to turn the 2D Helmholtz equation into a boundary integral equation. Numerical integration is much simpler to program, and the number of dimensions in my problem was reduced. Head over to the nearest Physics department. They know about Green's functions, if the other mathematicians don't.
I heard a talk by one of the NASA people running the project. He addressed several of the ideas in this thread. His justification for the lack of any dust-removing technology was that the rovers were already at their weight limits.
That is impossible. Any introductory textbook on electrodynamics will tell you that magnetic fields can do no work. There is a simple loophole -- a magnetic field can induce an electric field, which does work.
Americans should know that Cheney is not part of the White House. Number One Observatory Circle is the official residence of the Vice President of the United States, and Cheney rarely goes near Bush so they can't get killed at the same time.\end{pedantry}
I had a book that swore up and down that the oven method was wonderful. The authors claimed to have baked many keyboards with no ill effects. I tried it on one old, cheap keyboard and the plastic warped. No, they didn't say to turn the oven off before putting the keyboard in. The electronics were fine, though.
My bottom-of-the-line Dell B120 laptop runs Debian with the Beryl 3D interface beautifully. This probably says more about the quality of Beryl's optimizations than about Dell hardware. The only thing that doesn't work is the wireless, which I understand doesn't work with Windows either as Dell neglected to include an antenna.
Tip: Use a knoppix disk to install Debian - I can't figure out how to get vanilla debian's sound to work on this laptop.
Imagine letting anyone who wants to steal your car be able to search for your keys on Google Earth.
iirc, Vietnam helicopters had their rotors replaced every few days if they flew in dusty conditions. I might have the wrong war there.
Watts are a unit of power, not energy. Which did you calculate?
The reason why homework is better than study hall is that students work at vastly different speeds - and those that work faster are bored (and sometimes will bother those students who are still working) if they are forced to remain in study hall after they are done. It essentially punishes those who perform better.
There is no easy way to improve education, but I feel that the focus should be on increasing the number of teachers, decreasing class size, increasing the number of contact hours for students, and decreasing contact hours for teachers.
Apparently, that's also the size of all U.S. research libraries.
"2 Petabytes: All U.S. academic research libraries"
Not quite big enough to hold the current internet, and of course, the internet will be much bigger by then.
More likely this is some particularly odd marketing on the part of jajah. The headline is clearly pro-jajah and the body is unbelievable, prompting people to actually click the link to see if it goes to evidence (I clicked). Seeing as you cannot spell it, I would guess you have not used jajah either.