hwillis

96 ms·

961.
by hwillis 8y ago
I disagree with using it as a descriptor, but the literal meaning of the word holocaust is something like "burning everything". So in the context of global warming it's actually weirdly applicable.
962.
by hwillis 8y ago
The specialist applications of powder metallurgy are awesome, not to mention the fact that lots of refractory metals can only be used with sintered powder (eg tungsten). It should also be pointed out that powder metallurgy parts have lon
963.
by hwillis 8y ago
Solder dams come down to a bunch of factors, but the bottom line is basically the best dye is the one that lets the resin cure stable and strong. For instance, white dyes are hard (for a lot of things) because white dye particles are large[
964.
by hwillis 8y ago
Sure, but it doesnt depend on the load. Two different kinds of voltage variance.
965.
by hwillis 8y ago
Batteries have significant and unavoidable source impedance. When the current goes up and down, as it does once per cycle, tens of thousands of times per second, the voltage of the power bus would move up and down slightly. You can obviou
966.
by hwillis 8y ago
Not to mention that any recorded music is going to: 1. sound quite different because it was recorded by several point microphones instead of your actual ears 2. Already have distortion introduced by the microphone and recording equipment. T
967.
by hwillis 8y ago
> say, a $1,000 bottle of wine (which cannot be distinguished in a blind taste test from a $5 bottle)? Well for one thing, that's wrong- distinguishing wine is easy. Even people who are just pretty into wine can identify differen
968.
by hwillis 8y ago
You are wrong. Direct reduced iron[1] is made with natural gas instead of coal. The amount of steel currently made without coal is about the same as the amount of crude steel made in the US. [1]: https://www.midrex.com/new
969.
by hwillis 8y ago
https://robertsspaceindustries.com/funding-goals Almost 218 million.
970.
by hwillis 8y ago
Typical mixtures use eg potassium nitrate, sodium nitrate, and calcium nitrate. Salts are one of the most produced substances on earth. For instance, potassium nitrate is in virtually every fertilizer. I couldn't find how much is us
971.
by hwillis 8y ago
No, not really- negative prices are very short spikes. They aren't driven by fundamental oversupply, they're caused by fossil plants that are unable to ramp down their power output quickly enough to keep the grid in spec. The am
972.
by hwillis 8y ago
> Why would it not be possible to fashion an extremely powerful laser and sweep it across the sky in an area where gravitational clues indicate a dark object may reside? Lasers are not the important part here- collimation is. The closer
973.
by hwillis 8y ago
I do not believe that. 1. I can't find a source that says less than a few nanometers. 2. 300 picometers is roughly the diameter of a helium diatom. The head cannot possibly float through hydrodynamic means if an air molecule can barel
974.
by hwillis 8y ago
France reduces their penalty from load following by being the largest power exporter in Europe. Most grids drop down to ~30% of peak demand at night, while France only drops to around 75%[1]- almost exactly how much nuclear generation it h
975.
by hwillis 8y ago
...and I literally did, in the next paragraph.
976.
by hwillis 8y ago
The particles in a fusion reactor are moving at 10 km/s. They don't particularly care about gravity. For components of the reactor, gravity tends to be helpful. It's much harder to cool superconductors or generate steam if
977.
by hwillis 8y ago
I'm not making an argument from semantics- whether or not you approve of the above explanations, they are the reason nuclear power is commonly said to be incapable of load-following. If you want a detailed and reputable investigatio
978.
by hwillis 8y ago
You're both right- technically, nuclear reactors are on of the fastest-ramping sources available. A reactor in SCRAM can drop down to <10% of full output in minutes, and many reactors are capable of running at continuously at reduce
979.
by hwillis 8y ago
Very late response, but most of the gradual decreases in price have been to increases in specific energy (kWh/kg). Smaller batteries cost less per kWh because there is less material in them.
980.
by hwillis 8y ago
Normal car batteries are filled with sulfuric acid and lead plates. Obviously, you can't just dump that. The li-ion batteries that power EVs don't have acid. The majority of the chemicals are actually totally innocuous- the carb
981.
by hwillis 8y ago
Whoops, you're totally right- got my Chinese metals mixed up. 75% of US tellurium comes from China, and I must have gotten cross-contaminated. > The cadmium doesn't leak out of the panel any more than arsenic leaks out of cell
982.
by hwillis 8y ago
> The lithium is not recycled, due to economies of scale. That's part of it, but even if we had very large battery recycling operations it probably still isn't really worth it. It's not hard to get 90%+ recovery but the a
983.
by hwillis 8y ago
This is a small battery. The grid is very large.
984.
by hwillis 8y ago
The metals recycle well and very cheaply, with no need for human sorting like with plastics. Those make up the bulk of the material cost. Graphite and lithium are the only things that aren't currently recycled. Lithium is too cheap r
985.
by hwillis 8y ago
> Why is this not more wide spread? These figures suggest this is a no brainer. Am I missing something? Grid infrastructure isn't exactly agile. It's politics.
986.
by hwillis 8y ago
> IIRC most batteries contain a bunch of rare earth metals and aren’t great for land filling. That's incorrect. Batteries don't have any rare earth metals. You're thinking of cadmium telluride thin film solar panels, wh
987.
by hwillis 8y ago
Not sure if you're understanding what he's saying, but just in case: Bitcoin and similar are Proof-of-Work currencies, which have you do arbitrary hashes to prove that you deserve a vote on the blockchain. The cost of that comput
988.
by hwillis 8y ago
> I don't see how that would be possible (and at least the scientists at the ICPP don't believe it would be possible either That's down to the fact that emitting more than 8.5 RCP requires some insane choices. Like, as you
989.
by hwillis 8y ago
> A decade or two ago I was pretty optimistic. The world came together to phase out CFCs after all, albeit a problem an order or two of magnitude smaller. ps we started releasing CFCs again
990.
by hwillis 8y ago
You're talking out your ass.[1] > Annually laminated (varved) lake sediments offer considerable potential as high-resolution archives of palaeo-environmental conditions where other high-resolution proxy indicators are not available

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