thatcherc

8 ms·

61.
by thatcherc 4y ago
Section 2.1 in their linked paper ( https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/201... ) gives some clues. I think this is what's going on: GPS receivers work by figuring out how far away they
62.
by thatcherc 4y ago
I had a real "click" moment with Statistic Rethinking (2nd Edition) too! I never really "got" Bayes' Theorem before (could use it to solve homework problems and stuff but never appreciated it) but somewhere in SR Ch
63.
by thatcherc 4y ago
> 200 MHz on a Xilinx KU060 > (That specific clock frequency on that specific part carries heavy hints about what this core is intended for.) Fun clue! Looks like the Xilinx KU060 is a rad-hard FPGA for space applications. Does anyon
64.
by thatcherc 4y ago
National Institutes of Health?
65.
Compact electron accelerator reaches new speeds with nothing but light(phys.org)
3 points by thatcherc 4y ago|0 comments
66.
by thatcherc 4y ago
Commenter is probably referring to this incident[1] where a sodium-cooled nuclear reactor on a Soviet satellite ended up spraying a bunch of small beads of sodium into Earth orbit. The number and density of the beads makes them a long-lived
67.
by thatcherc 4y ago
Yup, I think that's the implication of the "space laser network". The plan for Starlink has been to have laser crosslinks between the satellites to provide coverage in places where the satellites can't directly see a gro
68.
by thatcherc 4y ago
Really neat design for this telescope array - checkout the image embedded in the article with the description: > Instead of looking out from a dome’s surface, the Argus telescopes will sit in a 10-meter-wide bowl, all aiming out a single
69.
by thatcherc 4y ago
The scope's sample rate really jumped out to me: > I configured the oscilloscope to collect 100M samples at 1 TSPS (tera-sample per second, 10^12) ... Wow! Sampling at 1000 GHz? I wouldn't have thought that was possible! Does
70.
by thatcherc 4y ago
BMW is a fun one! It is definitely meant for Air Force cadets in the early 70s (and the introduction says as much) so it's pretty approachable with a college freshman physics and calc background. The final "homework problem"
71.
New Research Says Vertical Solar Panels Have Improved Performance(cleantechnica.com)
1 points by thatcherc 4y ago|0 comments
72.
by thatcherc 4y ago
One of my favorite high(ish)-concept energy storage proposals takes the "store heat in tanks of something that melts and stays hot for long periods of time" is the "sun in a box"[0] idea: use excess electricity to heat s
73.
by thatcherc 4y ago
And in case anyone is new to Greg Egan, there's also the Orthogonal series (starting with The Clockwork Rocket) where the metric is (+,+,+,+) - the "time" dimension is just like the spatial dimensions. Pretty cool read with a
74.
by thatcherc 4y ago
Thermal power goes into the expansion of the plasma I'd figure, just like the hot gases in an internal combustion engine cylinder. Only here the work is done against a magnetic field instead of a piston.
75.
by thatcherc 4y ago
More like 5 seconds - (1.5e6 km)/(300_000 km/s) is 5.0 seconds. This makes sense as the Sun is 8 light-minutes away from Earth and JWST is closer to Earth than the Sun.
76.
by thatcherc 4y ago
The "integration to zero" effect the author observes is a consequence of the fact that the Fourier Transform is meant only for periods signals. Practically, we all often toss any time series data into an FFT to get a look at it in
77.
by thatcherc 4y ago
> Alternately it is something a billionaire could afford, like a James Bond villain in reverse This is roughly the premise of Neal Stephenson's new book Termination Shock , if anyone's looking for a (IMO pretty fun) fictional
78.
by thatcherc 4y ago
In the US these are usually considered wild blueberries, and the best ones of course come from Maine. The wild Maine blueberries[0] are a Vaccinium that grow on scrubby bushes low to the ground that can be hand-picked or harvested from bl
79.
by thatcherc 4y ago
> This will increase by roughly 35% ... I was a bit confused by this sentence (which is a direct excerpt from the piece). Reading the whole article, the `this` refers to the methane lifetime. Oddly (to me), the lifetime methane in the at
80.
How to Grow a Perfect Copper Acetate Crystal with Scrap Copper and Vinegar(crystalverse.com)
4 points by thatcherc 4y ago|0 comments
81.
by thatcherc 4y ago
Would this be in a scenario where homes are producing more electricity than they need, and using the extra to reduce iron oxide? With solar getting cheaper and cheaper, definitely a possibility. A system more similar to what we have in New
82.
by thatcherc 5y ago
What a treat that the default location is Mt. Battie in Maine! I saw the tower up there from town just about every day growing up. Fun to see it pop up online!
83.
by thatcherc 5y ago
Yeah, very important to electrify the supply side in the US as well. Pretty dirty at the moment. There are still gains to be realized just on the demand side though, like how EVs still emit less per mile than ICE cars even when the electric
84.
by thatcherc 5y ago
> Electrification requires energy-efficiency savings. I don't think it does. In principle, you could stay relatively inefficient with low cost to the climate as long as you were drawing power from overprovisioned wind and solar. Of
85.
by thatcherc 5y ago
The main action advocated by the author here is to increase efficiency (in insulation, appliances, food production, transportation) as a means to curb CO2 emissions and slow climate change - all very important. Lately I've been reading
86.
SpaceX shifts resources to cybersecurity to address Starlink jamming(spacenews.com)
18 points by thatcherc 5y ago|0 comments
87.
by thatcherc 5y ago
Interesting - 6 of the 7 languages discussed are Python libraries. Must be going for the more DSL type of language. Of the ones mentioned, looks like only Q# and QASM aren't Python-based.
88.
by thatcherc 5y ago
What would be a good search term to dive into "work directly at IP level and not use TCP or UDP at all"? Sounds interesting but not sure how to get there from just a basic familiarly with sockets.
89.
by thatcherc 5y ago
I recreated the delay-Doppler plot from the recent LoRa Moon bounce experiment I saw discussed here [1] and on Hackaday [2] with a bit of Julia code. The full results of the LoRa Moon bounce experiment should be released in the next couple
90.
Recreating the Lora Moon Bounce Delay-Doppler Plot(jthatch.com)
2 points by thatcherc 5y ago|1 comments

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