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fsh

4,753 karmajoined 7 năm trước

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Sub-part-per-trillion test of the Standard Model with atomic hydrogen

nature.com
3 points·by fsh·5 tháng trước·0 comments

comments

fsh
·1 giờ trước·discuss
Bohmian mechanics is nonrelativistic, so it has been "falsified" since its inception. It generally makes identical predictions to nonrelativistic quantum mechanics (i.e. the Schrödinger equation), but finding a relativistic version, equivalent to the Dirac equation in QM, has been difficult due to the nonlocality of the pilot wave.
fsh
·12 ngày trước·discuss
I once has the displeasure of using a SoftBank SIM in Japan which relentlessly spammed my phone with unblockable ads. The continuing survival of this company is proof that billionares that got lucky once cannot possibly fail.
fsh
·18 ngày trước·discuss
With smaller reactors, one needs more of everything: reactor vessels, containment structures, cooling systems, generators, etc. This is why industrial facilities are usually built as large as reasonably possible, and why SMRs fell out of fashion as soon as GW-class reactors became feasible in the 1960s.
fsh
·18 ngày trước·discuss
That would poison the entire country. Nuclear waste is many many orders of magnitude more radioactive than coal per energy generated. The meme about coal emitting more radiation comes from a 1970s paper that compared radioactive emissions and found them to be on the same order of magnitude between a BWR and an unfiltered coal power plant.
fsh
·18 ngày trước·discuss
Like most industrial sites, large reactors are much more economical than small ones. This is why nobody has built SMRs since the 1950s.
fsh
·21 ngày trước·discuss
Competing with four free GNSS constellations is an interesting business model for sure...
fsh
·21 ngày trước·discuss
GNSS receivers are passive devices that receive beacons broadcasted from the satellites. It's technically impossible to spy on someone with GNSS.
fsh
·22 ngày trước·discuss
With nuclear energy, you are dependent on whoever has uranium. This is not a theoretical risk, and already has political and economic consequences for the few countries with a large nuclear energy share [1]. It would be much worse if a significant amount of global energy was produced with nuclear energy.

[1] https://www.lemonde.fr/en/les-decodeurs/article/2023/08/04/h...
fsh
·27 ngày trước·discuss
The SVP campaign in favor of the initiative was something else. Half the country is plastered with their posters, and social media is full of astroturfing. It didn't pay off this times, but the propaganda dominance of this party is concerning.
fsh
·28 ngày trước·discuss
I recently had a document break because I used umlauts together with the subfigs package. Apparently both use " characters internally and clash badly. This is not a particularly exotic use case.
fsh
·tháng trước·discuss
The original iPhone was genuinely terrible. A 2006 Nokia could surf the web on the go and tell you where you are. The iPhone could do neither, since Apple did not include a 3G modem or GPS. It also did not have any apps, and one of the key features highlighted by Steve Jobs was voicemail. The 3G one year later was the first truly usable iPhone.
fsh
·tháng trước·discuss
Coal is much cheaper than gas.
fsh
·tháng trước·discuss
No, AMD wants to collect some rent from people running Vivado in CI/CD environments.
fsh
·tháng trước·discuss
Vivado is an IDE for programming AMD FPGAs. One cannot use it without buying AMD hardware.
fsh
·2 tháng trước·discuss
The roundtrip time is measured and compensated. Even NTP does this. Knowing the distance is not necessary for time synchronization.
fsh
·2 tháng trước·discuss
The users are paying plenty of money for AMD FPGAs.
fsh
·2 tháng trước·discuss
This is terrible news for university users trying to professionalize their FPGA development with CI/CD. Which is probably the point of the change.
fsh
·2 tháng trước·discuss
I don't get the point. The model has presumably been trained on all public GitHub code, so the evaluation is tainted anyway.
fsh
·2 tháng trước·discuss
At that point you can just pre-share a key and use AES.
fsh
·2 tháng trước·discuss
Chernobyl was supposed to be an economically viable means of generating electricity. Comparing a tiny billion-dollar submarine reactor to a power plant simply doesn't make any sense.