Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror

Comment Re: An endless supply of nuclear waste. (Score 3, Informative) 19

The GP's comment wasn't accusing there of being a nuclear waste problem (there isn't). They were talking about how nuclear waste can be burned in a breeder reactor, producing orders of magnitude more than the burning of a couple tenths of a percent of the natural uranium in a conventional reactor does.

Despite the press hype about thorium (which is way more popular among the media and nerds on the internet than with actual nuclear engineers), nuclear power is already basically unlimited, even without breeder reactors (which are very much viable tech, and much more mature than thorium). Only with an incredibly weak definition is it in any meaningfully way "limited" - if you limit yourself to currently quantified reserves, at current fuel prices, with production mining tech, you have a bit over two centuries worth at current burn rates. But this is obviously nonsense. Uranium production tech isn't going to advance in *two centuries*? Nobody is going to explore for more in *two centuries*? And as for "at current prices" - fuel is only a very small percentage of the cost of fission power, so who cares if prices rise? And rising prices or advancing production tech doesn't just put linearly more of a resource onto a market, they put exponentially more onto the market. As an example with uranium: seawater uranium could power the world's current (overwhelmingly non-breeder) reactor fleet for 13000 years, and current lab-scale tech is projected to be nearly as cheap as conventional uranium production at scale.

Also, if you switch to breeder reactors, you don't just extend the amount of fuel you have by two orders of magnitude - the cost of the raw mined uranium also becomes two orders of magnitude less relevant than its already very small percentage of the cost of fission power generation, because you need so much less per kWh.

As for any thoraboos in the comments section: thorium fuel is more complex and expensive to fabricate (fundamentally - thorium dioxide has a higher melting point and is much harder to sinter), it's more complex to reprocess (it's more difficult to dissolve), its waste is much more hazardous over human timescales, the claimed resistance to nuclear proliferation is bunk, the tech readiness level is low and the costs are very high, and it's unclear it'll ever be economically competitive - most in the nuclear industry are highly dubious (due to what's needed to actually burn it vs. uranium). Hence the lack of investment. And I say this with the acknowledgement that nuclear power is already a very expensive form of electricity generation.

Comment Re:Winter (Score 1) 67

Real world testing gives a wide variety of range reduction in cold weather, depending on the make and model of EV. Some are really good at maintaining range, some are lousy at it.
In any case, preheating the cabin and battery cuts that substantially, and you generally don't need to keep warming the battery while driving as the regular discharge and charging from regenerative braking keeps the battery at operating temperature to limit range loss.
It's a contribution, but it isn't something like 30% is what he's getting at. More likely ~5%.

Comment Re:Seriously (Score 1) 186

FYI, you get quantum-avalanche effects and tunneling triggering them in reversed PN-junction and they are apparently roughly 50% quantum noise (same for Zeners around 5.6V, essentially same effect), and that is, to the best or our knowledge, truly random. Yes, I have done some measurement series with that a decade back or so.

Ah, so you're telling me AI would have quantum effects in its synapses. Fascinating ;)
Your self-pwn on this one was pretty impressive.

Well, you are just digging yourself deeper. Ok, lets go one step further in your self-disgracement: 1. There are no synapses in AI 2. Reverse PN is not a standard operating mode for transistors and only applies to bipolar transistors in the first place. 3. Computers are using MOS-FETs. 4. Computers are optimized for digital, entirely deterministic computations, nobody wants avalances in there. If they happen, the computer crashes.

But I bet all of that flies right over your head, because you are obviously completely clueless.

Slashdot Top Deals

"Luke, I'm yer father, eh. Come over to the dark side, you hoser." -- Dave Thomas, "Strange Brew"

Working...