hwillis

79 ms·

931.
by hwillis 7y ago
> Most (all?) production electric cars struggle to do a full power complete lap of Nürburgring Nordschleife without heat-related issues. They're amazing at the Stoplight Grand Prix (and I enjoy my cheap LEAF daily), but struggle as
932.
by hwillis 7y ago
> It seems like you responded only to the gravimetric density part of the chart and not the volumetric part of the chart. Gravimetric (specific energy, Wh/kg or MJ/kg) energy is generally more relevant than volumetric (energy d
933.
by hwillis 7y ago
> Will charging speed really only be of minor importance? How do you charge your vehicle if you live in an apartment building? And if you can't do that and charging at a station takes more than 3-5 minutes then you cut out a huge p
934.
by hwillis 7y ago
Again, an 11% increase. It's tiny. My point is that it's vastly outweighed by other effects, not that it literally does not exist. I'm making the case that treating the specific energy/energy density of batteries as th
935.
by hwillis 7y ago
> There was no electric grid to speak of - even now there is concern the grid can't support all EV's, once you were outside the cities (and there weren't many back then) the grid was spotty. The miracle of being able to po
936.
by hwillis 7y ago
This is an incredibly myopic take masquerading as "first principles". First, you're flat wrong on the differences between gas and batteries, especially for cars. Second, you need an actual reason energy density is the f
937.
by hwillis 7y ago
Can do, although you might be better off using a hard conformal compound (black stuff used for potting electronics) where possible. It has a lower viscosity and is less prone to bubbles. I'm not sure how much small bubbles would actu
938.
by hwillis 7y ago
This is a suspended style, unlike the Japanese maglev- it's much more like the old transrapid[1] which used a set of coils underneath the track to pull up the train. There are pros and cons to both. The Japanese maglev uses large unpo
939.
by hwillis 7y ago
It has been argued for a VERY long time that grand juries (which is why she can be put in jail repeatedly like this) are unjust. Many states do not even use them because of it. Grand juries get special privileges, like compelling people t
940.
by hwillis 7y ago
> The law that says you must do what a judge orders isn't unjust. It has been argued for a VERY long time that grand juries (which is why she can be put in jail repeatedly like this) are unjust. Many states do not even use them bec
941.
by hwillis 7y ago
https://cms.dot.gov/sites/dot.gov/files/docs/2016%20Revised%...
942.
by hwillis 7y ago
same reason street cars aren't hard limited to 70 mph with low acceleration
943.
by hwillis 8y ago
Depending on the car and the temperature you'd much rather be stranded in a Tesla (or another EV that works as well at low temperatures). A Tesla can run its heater on full blast for well over 12 hours. In ICE cars that don't ha
944.
by hwillis 8y ago
Note that the heater in the model S/3 is capable of ~6/4 kW. In most cases you won't be running the heater on full for an hour, but at -10 you might be. When you start talking about 12-24 miles of range per hour, that'
945.
by hwillis 8y ago
It is actually true. The battery stores just as much energy when it's cold, and has higher efficiency. The problem is that that efficiency drops dramatically as you try to pull more power. A very simplified explanation would be that
946.
by hwillis 8y ago
Wind can put electricity on the market even without subsidies. They have every incentive to do so, since it costs them absolutely nothing to put energy into the grid while forcing fossil fuels to pay a premium. If the government didn'
947.
by hwillis 8y ago
> Are there super capacitors with expected lifetimes measured in centuries / millennia? No, certainly not. Supercapacitors self-discharge significantly faster than batteries do. Capacitance is proportional to the surface area of t
948.
by hwillis 8y ago
> The economic impact analysis comes as the NEA is facing severe cuts under U.S. President Donald Trump’s proposed budget, and one year after the agency staved off the threat of total elimination by his administration. Did you somehow re
949.
by hwillis 8y ago
Problem with that is all about ordering. Verbally ordering is very efficient and the bartender can track you down if you move or try not to pay, and can remember your face and tab. Not easy or reliable for a robot, and a human will be abl
950.
by hwillis 8y ago
Low-end arms are ~5k. This is just quite small, a Mitsubishi RV-FR series, payload ~5 kg. 300k+ robots are things like the KUKA KR1000 ("Titan"), which can literally toss around cars. It's got 200x higher payload for <2
951.
by hwillis 8y ago
That's a Mitsubishi RV4FR or RV7FR series arm[1]. It's a full on industrial arm, not an in-house solution. Industrial arms are some of the most well engineered devices on the planet; they are expected to last decades of nonstop,
952.
by hwillis 8y ago
https://slatestarcodex.com/2018/07/10/melatonin-much-more-th...
953.
by hwillis 8y ago
People always ask this as if it's impossible to change laws or have agencies that actually want to follow through on their missions. As if corporations are so devious and brilliant they are unfindable. It's just not true. If yo
954.
by hwillis 8y ago
Only profits are taxed, and they're only vaguely related to revenue, and both profit and revenue are vaguely related to whether a company is a monopoly or not. Profit is an okay-ish measure of how much a monopoly a company is, but not
955.
by hwillis 8y ago
You can use pretty much anything for that, it only really depends on how big you want it. https://www.digikey.com/product-detail/en/seeed-technology-c...
956.
by hwillis 8y ago
> You can get model aircraft jet engines with enough power for this.[1] Various human-carrying craft have been built that way, such as the Zapata Flyboard.[2] But the engines have a lifespan measured in hours and not enough reliability f
957.
by hwillis 8y ago
> The new calculation indicates that for ordinary sound waves in most materials, the mass carried is equal to the sound wave energy multiplied by a factor that depends on the speed of sound and the medium’s mass density. Since the effect
958.
by hwillis 8y ago
> Marketing and R&D are not pieces of a fixed pie. Marketing spend grows the entire pie and provides additional dollars for the company to spend on R&D. You're talking like marketing extracts money from the ground as if it&#
959.
by hwillis 8y ago
Yes. And you are not a foreign national. ITAR does not apply to US citizens OR permanent residents. It even allows some refugees and asylees. In fact, Clifford Chance LLP recently settled after improperly terminating several green card e
960.
by hwillis 8y ago
If you have a green card (and most likely you'd need to renounce your other citizenships) you can work there. ITAR and other CUI (and even a lot of classified stuff) is only restricted for foreign nationals.

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