hwillis

77 ms·

841.
by hwillis 7y ago
SpaceX is completely changing the opportunities of getting to space. The reduction in price has been nuts. According to NASA the space shuttle was ~$450 million per launch, or $16,364 per kg to LEO. The Delta 4 Heavy is $12,156 per kg. For
842.
by hwillis 7y ago
Definitely not hotdog (assuming that's from stem to stern). Musk wasn't totally clear when describing it, but he said mk3 would be in three months. The circumference of starship is 28.26 meters. For a single weld the entire len
843.
by hwillis 7y ago
That absolutely does not follow. Test pilots are prepared and trained for the extremes of control. It's a totally different skillset. The point of the test flight is to push the plane as far as it will go. Practically all drivers, r
844.
by hwillis 7y ago
> I don’t like calling it a human right. That implies the doctors are enslaved to provide care. No rational and highly intelligent person will pursue medicine as a career if it’s going to require 12 years of education before conscription
845.
by hwillis 7y ago
The article is about how many of the lite mode optimizations were added to the last 7 v8 releases, resulting in an 18% reduction vs lite mode's 22%. The people responding to you are making the case that the 18% reduction is basically
846.
by hwillis 7y ago
That's an understatement. Li-air batteries would solve the energy density problems for electric planes. Storing energy in nuclear isomers would be more suited to like... single stage to orbit electric scramjets. Hovershoes and laser
847.
by hwillis 7y ago
> If this is anything like growing single-crystal parts for aircraft, it won't be cheap. I'm still catching up, but it won't be expensive like that. You grow single crystals by keeping them hot and cooling them very slowl
848.
by hwillis 7y ago
This cell has ~20-30% lower capacity per volume.
849.
by hwillis 7y ago
As someone who works in gov contracting, please no. Spend money literally any other way. Give it to the DOE. Fuck, just signing Musk a check would probably be better. The DoD is singularly ineffective.
850.
by hwillis 7y ago
> Anti-depressents have a good track record, though imperfect. Antidepressants and particularly SSRIs are incredibly important and I think we should continue to prescribe them as we currently do. I even think that their lackluster perfo
851.
by hwillis 7y ago
> Apparently you can make money by connecting a battery to the grid as the one in South Australia does make money, but I have no idea how it does it. It is called the ancillary market. Basically if the grid voltage or frequency drifts o
852.
by hwillis 7y ago
A supercharger tops out at 250 kW throttles down when the battery pack gets to ~115 F. Hot water heaters run from 120-140 F. Domestic circuits at at most ~7kW, so you'll realistically never be able to do anything useful with the wast
853.
by hwillis 7y ago
Very unlikely. Winter batteries aren't a huge problem as long as you are gentle until the pack is warm. Hot batteries are more of an issue, as they don't really like temperatures above 90-100 F. Keeping the battery at half char
854.
by hwillis 7y ago
No, but it is common to treat them as if they were. It depends on the chemistry as some are worse, but charging is slightly rougher than discharging. During charge the lithium ions need to intercalate into the graphite anode, which is slow
855.
by hwillis 7y ago
I think it is referring to the fact that it is ubiquitous to leave some amount of reserve so that the battery is never fully charged (100% SoC) or discharged (0% SoC). This formulation is capable of going the full 0-100%, while most formul
856.
by hwillis 7y ago
It is not. This is a fairly conventional cell, with a different crystal structure for one of the ingredients, and a tweaked mix of liquid electrolytes. The most important part of this paper is that they actually prove that optimizing for c
857.
by hwillis 7y ago
1) 532 is not a new chemistry. It's not even the lowest cobalt chemistry; there's 511 and 811 beyond that (811, or 80% nickel, 10% manganese, and 10% cobalt, is not yet technically feasible). 2) Range is decreased. 532 has lower
858.
by hwillis 7y ago
> the limited data available was largely positive yet research was basically banned. Which is prima facie insane ; these drugs are named for their ability to affect the brain, and have some of the most diverse and potent effects of know
859.
by hwillis 7y ago
> In cities, we will need chargers by every parking space There are a number of alternatives that are not nearly as onerous. EVs do not need charging every day, and few people in cities need to drive every day. If you only drive 10 mil
860.
by hwillis 7y ago
I'm torn on Goodenough's (and his other main author, Maria Helena Braga) academic contributions lately. They are doing a lot of investigation into glass electrolytes, something that is very important and potentially the future of
861.
by hwillis 7y ago
Go Johnny go!
862.
by hwillis 7y ago
Second- 1/3 is about what you'd expect for a Peltier module at a similar temperature difference.
863.
by hwillis 7y ago
"Completely sustainable" is a technically true but only for a fairly low (<20%) percentage of locations. It's just evaporative cooling, so it relies on a large water supply. It also increases local humidity significant
864.
by hwillis 7y ago
AC is still a status signal, even outside the American south- when was the last time you were at a movie theater or a bank that wasn't colder than it needed to be, even uncomfortably so? It's traditional of places that try to i
865.
by hwillis 7y ago
To vastly simplify: Since one signal is zero resistance (zero loss) and one signal is infinite resistance (zero loss), switching between the two requires a finite time spent at a resistance between the two (nonzero loss). Every change requ
866.
by hwillis 7y ago
here you go: https://www.arm.com/products/silicon-ip-cpu/cortex-a/cortex-... > OK, it's a cart and horse affair as it is the resistance that causes the heat, Most of the heat comes from semiconductor
867.
by hwillis 7y ago
It could be reasonably called inciteful, but it's not ideological. It's a factual observation that liberty is diminished by power structures of all kinds. Monopolies and unfair economic arrangements can exist without any explici
868.
by hwillis 7y ago
Yes, that is almost verbatim what Marx said: "'theft' as a forcible violation of property presupposes the existence of property." So to put it more clearly: Proudhon was clear that his opposition to property did not exte
869.
by hwillis 7y ago
The most obvious way is that carcinogens affect parts of the body differently. Iodine collects in the thyroid, some compounds accumulate in the gut, alpha and beta affects the outer layers of the body. Epigenetics can cause different parts
870.
by hwillis 7y ago
Trump was talking about him "liking girls on the younger side" in 2002 . Epstein pleaded guilty to soliciting an underaged prostitute in 2008, sane people had been distancing themselves. Anybody who had anything to do with Epst

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