hwillis

44 ms·

511.
by hwillis 5y ago
> We have experimentally estimated in our preliminary study that the apparent T1/T2 values for gray matter and white matter were approximately 330/110 ms and 260/100 ms at 0.055 T (vs. 1300/110 ms and 830/80 ms a
512.
by hwillis 5y ago
> If you can lock the movement into a specific position and it's repeatable because of the geometry of the motor, it's a stepper. BLDC, series wound, and switched reluctance motors will also hold their position. Cogging torque
513.
by hwillis 5y ago
> it is a matter of principle, does the movement occur in discrete steps or does it occur by continuous movement through a magnetic field? motor typology is not well defined, so we're arguing a moot point. That said, I think this i
514.
by hwillis 5y ago
Pedantic: this isn't a stepping motor, it's just a plain linear motor. Stepper motors have multiple teeth per pole: https://en.wikipedia.org/wiki/Stepper_motor#/media/File:Step... The rotor has slig
515.
by hwillis 5y ago
What an insane thing to say. 60 GHz is more than enough to get completely recognizable images with a sufficient transceiver https://www.researchgate.net/figure/Millimeter-wave-40-60GHz... There's a huge differenc
516.
by hwillis 5y ago
Acoustics is a more direct parallel, and even uses the same unit- the acoustic Ohm. The hydraulic Ohm also exists, but is not really used. Helmholtz resonators[1] are used to provide capacitive acoustic impedance in a gas system. Archetyp
517.
by hwillis 5y ago
It can get you into trouble in real (high pressure, specifically) hydraulic circuits, since hydraulic pumps/actuators are almost always flow (current) sources instead of voltage/pressure sources. It's almost a fundamental ru
518.
by hwillis 5y ago
You're responding to a question about suicide with a completely different article about opioid deaths, and the article itself attributes those deaths to the still-increasing substitution of fentanyl, which has nothing to do with lockdo
519.
by hwillis 5y ago
With .5" of monthly rainfall and nearly no seismic or insect activity to speak of, you could make any house in Coober Pedy last nearly forever.
520.
by hwillis 5y ago
Or like, look at any of the million dilapidated houses and realize that 1. most houses leak at some point and 2. termites eat wood. Then conclude that actually, maybe .0001% of wood houses lasting for 1000 years is not actually good eviden
521.
by hwillis 5y ago
Okay, so your step #1 for building a 1000 year house is to just... have a house that never has any leaks or termites? I can see some issues. If you want something to last, you plan for when it does go wrong. You should be designing a ho
522.
by hwillis 5y ago
For the curious, Russian gauge is/was 5 ft (1,524 mm) and standard gauge is 4 ft 8 1⁄2 in (1,435 mm). Soviets eventually redefined it to a round metric number (1,520 mm), but that's a very small difference. Track width varies by
523.
by hwillis 5y ago
For 5-20 MVA you're talking about 67 kV substations or similar, where a transformer costs in the low 6 figures. HVDC converter stations in the same range would cost somewhere around 8 figures, although that's mostly a guess- you
524.
by hwillis 5y ago
Ludens is absolutely legendary. This is part of his micro hydroelectric dam[1], which he uses to power his house, which he of course built himself. Far different, but if you enjoyed this you may also enjoy another classic (which does not h
525.
by hwillis 5y ago
That's what SNPs are. Specifically, point mutations that are associated with known outcomes (ie diseases) or with group differences. Point mutations occurring outside SNPs are almost by definition not yet useful. If we know what the
526.
by hwillis 5y ago
set flowFilePretty to true (splits up lines in function nodes) and use node-red-contrib-flow-manager to split flows up. [1] https://flows.nodered.org/node/node-red-contrib-flow-manager
527.
by hwillis 5y ago
Electric motors can autorotate just fine: https://youtu.be/QADYnVeHQOQ You can't descend quite as slow as a normal engine because the motor has somewhat more friction at low RPM, even though it's similar to free-s
528.
by hwillis 5y ago
It does (everything is saved as json), but it's a bit of a hassle. Scripts are saved to a single line, so you really need a plugin that breaks them up. It's really pretty silly that isn't the default. The other huge PITA is
529.
by hwillis 5y ago
about 1/3rd correct. It is not made with epoxy[1]. Bamboo lumber is made with urea formaldehyde just like plywood. UF is made from CO2, ammonia, and methanol[2]. Methanol can come from plants or from fossil fuels. Ammonia uses 55%
530.
by hwillis 5y ago
In contrast to /user?id=minihat here's an ELI5: The brain is not an electric circuit. It's more like a hydraulic or osmotic circuit. Thought is powered by tiny flows of sodium ions, not flows of electricity. Specifically,
531.
by hwillis 5y ago
> I believe there were also some tests using it to measure level of attention in fighter pilots. I would not put much (any) stock into this. The army has put out RFPs for using magnetic tourniquets to induce clotting without external pr
532.
by hwillis 5y ago
https://ufile.io/4q5i4afz
533.
by hwillis 5y ago
https://ufile.io/4q5i4afz
534.
by hwillis 5y ago
https://ufile.io/4q5i4afz
535.
by hwillis 5y ago
https://ufile.io/4q5i4afz
536.
by hwillis 5y ago
1. Totally disagree- these slides should be treated like a hostile witness. This is one of the largest companies in the world on the back of advertiser and investment faith. Facebooks public image is paramount to its continued success and
537.
by hwillis 5y ago
Absolute nonsense. Motors are do not care whether they are generating or consuming electrical power. It is a fundamental fact of induction that rotation in the motor creates a reverse voltage - motors literally would not work if they did
538.
by hwillis 5y ago
arguably the same thing. If you want to get pedantic, "ESC" refers to a specific subset of drive topologies that are all fairly lossy on the D axis, meaning the efficiency drops at low speeds or under heavy acceleration. "Dr
539.
by hwillis 5y ago
> Therefore the claim that an injection of RNA could modify your DNA is possible. Absolutely not. This is like saying water is a neurotoxin because a tiny subset of neurotoxins contain water. Or that almost any food can modify your
540.
by hwillis 5y ago
But the re-absorbed CO2 will come from new limestone dissolving into calcium bicarbonate, not from atmospheric CO2. You'll be adding more CO2 to the air -increasing oceanic acidification- while increasing the ocean's ability to

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