hwillis

16 ms·

151.
by hwillis 2y ago
> Most automotive Lidar already operate in a “photon starved regime”, ~200-300 photons per return[0]. If you spread that over the entire scene, your snr drops quickly. Translating: Normally you have a large single sensor per laser, which
152.
by hwillis 2y ago
China has more distributed/rooftop solar than the US, percentage-wise. It's hardly like every big building in the US has rooftop solar, and Zhengzhou is more to the north of the country where there is less incident light. That sa
153.
by hwillis 2y ago
They split the emissions cost out separately, FWIW: https://www.nature.com/articles/s41560-024-01655-y/figures/3
154.
by hwillis 2y ago
It looks like that is a conversion and retrofit of ships that were already unmaintainable: https://washingtonstatestandard.com/briefs/conversion-of-was... Modernizing all the control systems etc is the nightmare. The
155.
by hwillis 2y ago
Wow, this is a really good paper. Supplementary info is really great too- they get into details down to floating charging port stations as part of the infrastructure. Surprising how much demand is from tugboats. I have questions about ho
156.
by hwillis 2y ago
paper link: https://www.science.org/doi/10.1126/sciadv.adp3953
157.
by hwillis 2y ago
https://cepr.net/our-funders/ charitable foundations and donors. basically the same groups as "Sesame Street was brought to you by..."
158.
by hwillis 2y ago
> The long-term side effects of GLP-1 drugs are not well-studied GLP-1 is a hormone that is released every time you eat, and the drugs are virtually identical hormones at natural levels that take ~100x longer (half life of a couple hours
159.
by hwillis 2y ago
> It’s a neural network without weights. It has approximate weights. Neuron connection strength is determined by the number of synapses (1-100s, sometimes 1000s), the type of synapse neurotransmitter, and the number of receptors. The co
160.
by hwillis 2y ago
https://perfecthairhealth.com/why-krox20-isnt-a-miracle-hair...
161.
by hwillis 2y ago
> and we(as the consumer) pay for it in higher ticket prices. With an air transport pilot flying 700 hours and making $220k annually, with 300 flights and 150 people per flight, that's <$5 per seat. The flight crew's wages
162.
by hwillis 2y ago
Fatal heart attacks at 37 and 40 are crazy. The DGCA's 2024 handbook reports 9,390 pilots and copilots (page 25[1]). Heart attacks at very young ages are more common in India because of rates of smoking and diabetes, but not that c
163.
by hwillis 2y ago
No, they didn't. When an artist draws a picture of Manhattan, they draw steam coming up from the streets and no utility poles. They don't need to know anything about the buried power infrastructure or steam pipes. It would pr
164.
by hwillis 2y ago
The cells are the areas closest to the voronoi sites, the dots inside the cells. The sites are the outputs of the optimizer; it adjusts the sites until the constraints are met well. The number of sites is chosen by the user. The excess si
165.
by hwillis 2y ago
The algorithm prefers rectangular rooms, you'd just need to adjust it a bit. The wall loss function minimizes wall length and tries to regularize angles, so it naturally converges to square-ish rooms: > we compute the norm of the t
166.
by hwillis 2y ago
Windows and pipes/vents are just constraints. Windows are constraints to outside areas and pipes/vents/stairs are constraints between floors. Rectangularity is enforced by the wall loss function, which is adjustable. > pe
167.
by hwillis 2y ago
Diatoms reproduce by separating the two halves of their shell and regrowing a new half. It seems to me that it would be difficult to predict the shape without an existing half shell. If anything, the shape is probably mostly determined by
168.
by hwillis 2y ago
What matters is the field gradient. The field inside the core of the MRI is pretty homogenous, so if the metal is in there when it's switching on/off then it's fine. They will put a precautionary shield over embedded shrapn
169.
by hwillis 2y ago
TSA scanners run around 30 GHz, which can only go ~1 mm into body tissue. It also isn't as high resolution as a camera, and objects a few mm wide won't get picked up well.
170.
by hwillis 2y ago
https://stealthev.com/product/tesla-module/
171.
by hwillis 2y ago
> Weight: You're adding about 500 lbs to the car to do this with ~20 miles of ev range. No. The drive unit of a Tesla + 4 battery modules weighs 500 lbs. That's 21 kWh, 80 miles of range and 500 horsepower. And 300 lbs of th
172.
by hwillis 2y ago
> i.e. the petrol engine effectively just runs a generator to the batteries. You don't need prop shafts/gearboxes/transfer case/axles/alternator/starter etc. But you can't take advantage of that without
173.
by hwillis 2y ago
Not true. What a series hybrid does is give you big-engine power for small-engine efficiency. Pull onto the highway and you get 350 hp from the battery, which the engine recharges at a steady 50 hp. If you have a big engine you are only
174.
by hwillis 2y ago
Absolutely correct, evolution will never ever beat a 10 cent ABEC-7 bearing. Skateboards really changed manufacturing by making a specific size of wildly precise bearing incredibly cheap. One day a robot will be able to step directly onto
175.
by hwillis 2y ago
true, but recycling proteins is also pretty amazing. These are the most complex machines we know of, elegant atomic factories that do the seemingly impossible... and you dip them in acid and then you can pop them apart like a string of bea
176.
by hwillis 2y ago
Irrelevant. If it's not an open circuit, then the inductor is connected to things in parallel, and the impedance increase creates a voltage spike. If the load impedance is significantly lower than the thing being disconnected, then y
177.
by hwillis 2y ago
It is the clutch. The clutch is your flywheel; it's free floating and connected to the driveshaft with springs. When its engaged, it is connected to both shafts by springs. When it's disconnected it's only connected to t
178.
by hwillis 2y ago
I wouldn't. We have been trying[1]; humans are genuinely shocking in this way. Mechanical systems should have so many advantages over humans; springs are 10x better than tendons, motors are 3x better than muscles. It's possib
179.
by hwillis 2y ago
Actually, no! Producing ATP is ~30% efficient, which is much better than premium consumer solar panels. And while that heat is technically waste, even if it was more efficient we would still generate heat other ways just to keep warm. Wha
180.
by hwillis 2y ago
> graphene was supposed to be this wonder material, and now it's found in the soles of trail and hiking boots. I mean, that's not because graphene has become a routine part of our material repertoire. It has no reason to be in

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