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seen Nov 24 at 19:54

Aug
18
answered Four vectors from spinors
Aug
15
comment What new breakthrough energy technologies are close to being realized?
@Zassounotsukushi You do not need breakthrough technologies. Mass production and reasonable but constant investments in technology is enough. Consider cars production. There were no significant discoveries in last 50 years. However, average modern car is rather different from its ancestor. Moreover, hybrid cars show that 50% difference may be nullified by taxes.
Aug
15
comment What new breakthrough energy technologies are close to being realized?
@Zassounotsukushi It has little to do with final prices in few decades perspective (if it works of course). Prices are that high because it is big device with cutting-edge technologies. Pentium processor with 50s technology would cost more than world economy. In 30s nobody could imagine that enrichment of uranium will be ever cheap enough to burn it for electricity. Smaller Tokomaks and progress towards boron fusion reactors are hardly possible without simpler (but bigger) ITER. Have you ever seen first integrated circuit? Anyway, price for nuclear station is few billions. Which is comparable.
Aug
15
awarded  Commentator
Aug
15
comment What new breakthrough energy technologies are close to being realized?
Where did you take estimates of tokomak electricity costs? 1) It is hardly possible to get the numbers before technology is ready. 2) You did not mention the cost of "alternative" power. Solar and wind energy are extremely expensive and there is natural limit which originates from low density of the energy you should collect.
Aug
15
answered parallel/anti-parallel vs. triplet/singlet description of two spins
Aug
13
answered In dimensional analysis, why the dimensionless constant is usually of order 1?
Aug
8
comment What new breakthrough energy technologies are close to being realized?
@Ben Crowell I am not a specialist in this area also, but I know some. The main problem is that at the current stage (and some previous steps also, e.g. AFAIK 15 years ago they had no idea even how to stabilize plasma) you can go no further without experiments. It's the normal for a really new technology: you know what you should do next, but without experimental result from this next step you can not predict what will be later. Physicists like this situation, but managers do not. As a result, it is hard to find money for this next step which is known.
Aug
7
revised Dimensional analysis restricted to rational exponents?
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Aug
7
comment What new breakthrough energy technologies are close to being realized?
@Ben Crowell This old joke might have its roots in economy: in 60s experts extrapolated money spent on study of fission. With similar money probably their estimate was correct, but money were completely different. Then in 70s experts extrapolated money spent on important and perspective technologies, then in 80s just on science, and so on and so fourth...
Aug
7
answered Dimensional analysis restricted to rational exponents?
Aug
7
answered Examples where an ill-behaved function leads to surprising results?
Aug
3
comment How beam focusing looks like in electron microscope?
@mmc Ok, for SEM I was wrong. Our experimentalists use TEM only.
Aug
3
comment How beam focusing looks like in electron microscope?
I know that my answer is not an answer. Your question was about electron microscope though. Electron lithography is another subject. I'll just point out to the fact that a lot of good labs have their own electron microscopes. Very few have their own electron lithography machines. Probably, due to significantly higher cost and complexity.
Aug
3
revised How beam focusing looks like in electron microscope?
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Aug
2
answered How beam focusing looks like in electron microscope?
Aug
2
revised How to make a single crystal silicon wafer?
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Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
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Aug
1
revised How to make a single crystal silicon wafer?
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Aug
1
revised How to make a single crystal silicon wafer?
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