uvdiv

43 ms·

301.
by uvdiv 14y ago
the article is difficult to understand for a layman as myself but an important fact (among others) is that the uranium reserves on earth are considered to last for 100 years at 2008 levels of consumption. An even more important fact is th
302.
by uvdiv 14y ago
What do they mean by "long-lived waste"? Actinides of half-life 100-100,000 years or so. These have a compounding disadvantage in that they are alpha-emitters, hence disproportionately radiotoxic (e.g. by ingestion) compared to gamma- and
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by uvdiv 14y ago
I imagine Fukushima or Chernobyl would have benifited from 72 hours extra to get their act together. Well, I'm not sure. Chernobyl isn't relevant because its issue was one of supercriticality (milliseconds, explosions), not decay heat (ho
304.
by uvdiv 14y ago
This is dubious. The cheapest way to "get rid" of weapons-grade plutonium is to dilute it as fuel in conventional reactors (so-called "MOX fuel" -- MOX for "mixed oxide", mixture of uranium and plutonium). It's not difficult. This doesn't m
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by uvdiv 14y ago
29 under construction in China, simultaneously: http://www.iaea.org/PRIS/WorldStatistics/UnderConstructionRe... Rather an exception of course. But a big one.
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by uvdiv 14y ago
You're confusing molten-salt reactors with molten-sodium reactors (different beasts). Molten fluoride is also reactive with water (hydrogen fluoride anyone?), but often MSR proposals don't involve water (they go for helium or CO2 gas turbin
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by uvdiv 14y ago
Here's a source to back that -- a talk from one of the researchers involved: http://www.youtube.com/watch?v=5UT2yYs5YJs Relevant stuff (liquid-fuel vs. liquid-coolant) somewhere around @23:30.
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by uvdiv 14y ago
My understanding is the reactors currently under construction in the US are being built with passive fail-safes that make them much safer than the 1960s/70s reactors. Is this incorrect? Modern passive heat-removal systems are limited: the
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by uvdiv 14y ago
A “fast breeder” version of a molten salt reactor has fast neutrons in the reactor core. These neutrons easily interact with the actinides, transmuting them into fissile isotopes and then fissioning them to produce energy. In other words,
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Germany to Repatriate Some of Its Gold Reserves(nytimes.com)
40 points by uvdiv 14y ago|57 comments
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by uvdiv 14y ago
You mean low-voltage DC distribution within a datacenter? That's useful but it's a different issue: the object here is long-distance (~1,000 km), high-voltage (~500,000 V) transmission. Economist didn't make this clear enough. http://www
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by uvdiv 14y ago
How is it unreasonable for open-source OS developers to be concerned about closed-source blobs in cryptographic components?
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by uvdiv 14y ago
Open access: http://arxiv.org/abs/1211.6256
314.
by uvdiv 14y ago
Saying something is fraudulent is libelous, It's not libelous, unless you're referring to legal definitions in specific repressive countries (such as the UK). Libel is a malicious lie. This is someone speaking their conscience.
315.
by uvdiv 14y ago
He's bitter about corn subsidies in the US. " sweeteners, fuels, and plastics " -- high fructose corn syrup, corn ethanol, corn ethanol-derived polyethylene " price manipulation and straight forward mandate from their "Environmental" agency
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by uvdiv 14y ago
No, it seems the point of their startup is sending messages to people very close to you, http://www.grabhalo.com/faq.html
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by uvdiv 14y ago
There's a tax break right in the article: "They pay more in sales tax (German installers are exempt)." But you're right, that the largest subsidy is not paid out of tax money, but through a (very large [0]) mandated surcharge on private u
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by uvdiv 14y ago
Not a Kalman filter, but rather a Viterbi decoder -- a type of error-correcting code. https://en.wikipedia.org/wiki/Viterbi_decoder From lurking on HN, I read that the whole field of ECC's is infested with patents. There's even an example
319.
by uvdiv 14y ago
Another commenter wrote an interesting reply to you. It got censored by friendly robot overlord, so I'll reproduce it: «Perhaps jennichen was suggesting that since the appeal has already been filed and the verdict might be overturned, the
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by uvdiv 14y ago
To be fair, most people already do this anyways by using passwords multiple times. At least they have no illusion of security. The scheme you showed provides lots of illusion, and zero security. This matters because, for the same effort,
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by uvdiv 14y ago
If you make your base password "[X]" then for logging into facebook you can use "[X]facebook" and gmail could be "[X]gmail" etc. If I did this, I would give Paul Graham access to my GMail, Facebook, and online banking accounts -- they'd a
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Photophone(en.wikipedia.org)
4 points by uvdiv 14y ago|0 comments
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by uvdiv 14y ago
This is probably unsatisfying, but it's where I read about it: http://www.demarcken.org/carl/papers/ITA-software-travel-com... ToC: http://www.demarcken.org/carl/papers/ITA-software-travel-com... You could email the author and ask him,
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by uvdiv 14y ago
It is a new type of electric rocket, based on laser-driven plasma wakefield accelerators (which exist and are being developed for particle accelerators). It does not exist as a rocket engine; it hasn't been scaled for that, but it appears t
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Ultrafast-laser driven plasma for space propulsion ("mars in weeks")(niac.usra.edu)
12 points by uvdiv 14y ago|1 comments
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by uvdiv 14y ago
Hence we punish those who don't want to take risks. They already get lower yields in proportion to their risk. Why punish them further by fiddling with yield curves, forcing the spread to be artificially larger? When one pulls low yields
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by uvdiv 14y ago
I read a hypothesis that airlines would be unsustainable without price discrimination. That is: if tickets were uniformly priced, there is no price at which ticket sales (demand) would exceed fixed costs. Without gouging business travelers,
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by uvdiv 14y ago
Bonds are an investment (?) Do you have some sort of ideological position on debt vs. equity, I didn't know that was even an issue. Bond holders should be punished for taking money out of circulation The money goes to the company or gover
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by uvdiv 14y ago
The purchasing power of my debts? No, not really.
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by uvdiv 14y ago
" Inflation punishes people who keep their money under the mattress instead of consuming it or investing it. " This is absolutely false. Inflation primarily punishes investors -- those who made fixed-income, dollar-denominated investments

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