chris_va

20 ms·

241.
by chris_va 5y ago
Probably want an activated carbon layer in there too, but that's only another $20.
242.
by chris_va 5y ago
I don't think there is a great prescriptive process here to follow, and we've kind of backed ourselves into a corner (but again I am not a forestry expert). The current practice is not a good equilibrium, but neither is going back
243.
by chris_va 5y ago
(disclaimer, I work in a Climate&Energy group and have been studying wildfires, though by no means a deep expert in forestry) The implication of this article is that we should have let the forests burn, and as a corollary we should go b
244.
by chris_va 5y ago
Agreed, there are only 2 options: - Lipid nanoparticle delivering mRNA expressing 1 protein (vaccine) - Lipid nanoparticle delivering mRNA expressing many proteins (virus), that has severe short term side effects Odds are much higher than t
245.
by chris_va 5y ago
What, would you have an entire movie with the husband sitting in prison slowly whittling away the time with a rock hammer? Never would get funded.
246.
by chris_va 5y ago
> still have energy left over ... if it's dry biomass. Too much humidity might tip that the other way, unless I am doing the math wrong. Looking at CA's forests right now, that might not be a problem :/
247.
by chris_va 5y ago
I am not a robotics expert, and I've always wanted to ask one... Why do these designs always have the actuators mounted directly at the joints? Why not have some high modulus yarn transfer the joint loads (ala a bike brake cable, say w
248.
by chris_va 5y ago
There are only a few that are truly scalable and plausible. A lot of investment today is going into the low hanging fruit (afforestation, methane capture, etc). These are cheap (<$15/ton), but they cap out at a couple of Gt-CO2&#x2F
249.
by chris_va 5y ago
It was not meant as critical, just that it's unclear to me. Unlike mining traditional crypto currencies, a carbon coin would require a large amount of capital equipment up front before mining. Bootstrapping without fiat capital would b
250.
by chris_va 5y ago
(disclaimer: I work in a Climate&Energy research group) Ignoring the perverse incentive problem... ... enhanced weathering only works under certain conditions. Randomly spreading some olivine around at a specific GPS location does not e
251.
by chris_va 5y ago
Yes, that does seem reasonable
252.
by chris_va 5y ago
No-till agriculture, as an example, usually requires different capital equipment for the farm. It's not a blocker, but financing the capital equipment takes some investment and risk. Farms are fairly dialed into their operations alread
253.
by chris_va 5y ago
The paper: https://advances.sciencemag.org/content/3/11/e1700895 And the paper for nanoPE: https://science.sciencemag.org/content/353/6303/1019 ... TLDR, they sandwiched a refl
254.
by chris_va 5y ago
Alcohol is intrinsically very caloric, that might be tough
255.
by chris_va 5y ago
Section 3.3 there, the Fourier analysis, looks really weak. If you just plot 89 random numbers between 0 to 270 it'll have strong spectral peaks. Their method: > After permuting the order of the intervals, a new time series was re-
256.
by chris_va 5y ago
(disclaimer: I work in a climate&energy group) I personally wish they would just continue selling gas cars, but with a lifetime fuel emissions offset built into the price. That would rapidly improve the maturity of carbon offset markets
257.
by chris_va 5y ago
Some class of vaccine hesitancy boils down to miscalculating expected value. The expected value of getting a vaccine is very high, but people choose not to anyway, presumably due to misinformation or miscalculation. Lotteries here are explo
258.
by chris_va 5y ago
> 150 GWh/annum is just 17 megawatts! ... no no no ... these aren't single use cells, instantaneous power isn't a meaningful unit (I mean energy/time is technically power, but one couldn't compare this to power a
259.
by chris_va 5y ago
Maybe this: https://www.fraserinstitute.org/sites/default/files/safety-i... ... (not my area, but I was curious too)
260.
by chris_va 5y ago
Fortunately, not at all. Was able to correct the orientation quickly, and just added power for a go around (about 100' AGL, so had time... but was very much not expecting it up at that altitude given sink rates for vortices) The tower
261.
by chris_va 5y ago
I was flipped sideways on short final in a 172 from a 7x7 (can't remember exact plane) that landed ~2 minutes prior on a parallel runway... it happens, though the vortices tend to sink fairly rapidly and are more of a concern for small
262.
by chris_va 5y ago
Wouldn't a microwave be easier (power, speed, penetration depth, etc)?
263.
by chris_va 5y ago
(I work on this for a living...) Yes, it includes things like sea level rise. Having said that, the giant knob hiding in the math is the discount rate. If you have $1 of damage in 2121, how much are you willing to pay today to avoid it? $1?
264.
by chris_va 6y ago
(disclaimer: I work in a Climate&Energy R&D Lab) I don't entirely agree with the overall assertion of this article. The author has some valid points, but I think it misses the forest for the trees. TLDR: I think Fortran tooling
265.
by chris_va 6y ago
I really cannot tell if the secondary market shares were common stock or preferred. $5B valuation for common shares is a very different thing than $5B for preferred shares.
266.
by chris_va 6y ago
"Bus driver seconds from driving over cliff, if only they hadn't turned to follow the road!" ... Nothing in this article seems specific to ERCOT's grid vs any random ISO seeing a demand/supply mismatch.
267.
by chris_va 6y ago
... what if someone inputs a random email address?
268.
by chris_va 6y ago
Satellite Altitude Lifetime 200 km 1 day 300 km 1 month 400 km 1 year 500 km 10 years 700 km 100 years 900 km 1000 years Their satellites are 550km, 1000km, and higher.
269.
by chris_va 6y ago
Most of the Starlink constellation is at 500km and higher, so a much longer lifetime. ... it only takes 1 collision to cause a chain reaction when we have 40k satellites, much less 1m.
270.
by chris_va 6y ago
Of course, grow-lights in Wyoming will be mostly coal powered, whereas a field in Salinas is renewable energy. Assuming I am doing the math right, shipping 1 ton of food 1000 miles (refrigerated) is roughly ~30-40kg of CO2, or about 7g-CO2

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