fsh

18 ms·

241.
by fsh 2y ago
The climate doesn't care which sector emits the CO2. For a societal analysis, focusing on only electricity makes very little sense.
242.
by fsh 2y ago
The french energy mix is around 50% fossil fuels [1]. The reduction in CO2 emissions over the last two decades were only due to better efficiency (lower energy usage) and renewables. [1] https://www.iea.org/countries/fr
243.
by fsh 2y ago
Small reactors have lost against GW-class facilities around 60 years ago. This is why they were no longer built. I find it strange to believe that the economy of scale somehow doesn't apply to nuclear power plants, even though history
244.
by fsh 2y ago
The measurement was already confirmed by a different group: https://arxiv.org/abs/2404.12311 This is important since impurities in the crystals used lead to all kinds of fluorescence that could be mistaken for a signal
245.
by fsh 2y ago
The accuracy of the hydrogen 1S-2S measurement was mainly limited by the second-order Doppler shift of the moving atoms (and to a lesser degree the AC Stark shift of the excitation laser and the 2S-4P quench light). The comparison between t
246.
by fsh 2y ago
The inputs of the formulas for the hydrogen energy levels in the paper are: The Rydberg constant, the fine structure constant, the electron-to-proton mass ratio, the electron-to-muon mass ratio, the Compton wavelength of the electron, and s
247.
by fsh 2y ago
I believe you might be confusing the QED calculations of hydrogen with those of the electron g-factor. Just have a look into the paper I linked (section VII). Most of the QED corrections are given analytically , no computers involved at al
248.
by fsh 2y ago
This is completely wrong. My laptop can solve the equations in fractions of a second. I believe that with some optimizations it should be trivial to do the calculations on a 1960s mainframe.
249.
by fsh 2y ago
We can absolutely simulate the hydrogen atom. This paper lists the equations and fundamental constants that allow calculating the hydrogen energy levels with around 13 digits of accuracy: https://journals.aps.org/rmp/ab
250.
by fsh 2y ago
They really don't. Maybe half as much, if they are lucky.
251.
by fsh 3y ago
It's in the article: 58.7 microseconds per day which corresponds to 17.6 km of position drift in navigation applications.
252.
by fsh 3y ago
Yes, this is a huge effect relative to the stability and accuracy of modern atomic clocks. Even a few hundred meters of elevation difference on earth is easily visible in clock comparisons and has to be accounted for.
253.
by fsh 3y ago
This is not what happens. The influence of the different gravitational acceleration on the moon compared to the earth is completely negligible for atomic clocks. However, the surface of the earth is at a lower gravitational potential than t
254.
by fsh 3y ago
Running Shor's algorithm requires essentially error-free logical qubits. Not a single logical qubit of that quality has ever been demonstrated. The Harvard results are impressive, but their logical qubits are worse than some physical q
255.
by fsh 3y ago
The core of modern oscilloscopes is often an FPGA that reads out the analog-to-digital converters at ~gigasamples/s and dumps the result into a RAM chip. Some companies (Keysight, Siglent) use custom chips for this, but FPGAs are very
256.
by fsh 3y ago
It's a creative toy, not a history book.
257.
by fsh 3y ago
Gemini tends to generate images of non-white people which made some white people very mad.
258.
by fsh 3y ago
I still don't understand why an effective 5% "discount" (not counting the effort to actually invest the money) makes the $5000 pill any easier to swallow. The money is still gone.
259.
by fsh 3y ago
I just don't get this obsession with taking on debt. "Financing" doesn't make a product any cheaper. If you can't pay $5000 now, you probably shouldn't buy the product.
260.
by fsh 3y ago
The DLP/LCD chips inside 4K video projectors have about the same pixel density.
261.
by fsh 3y ago
What are you basing this observation on? I haven't seen any significant improvement in photography or cinema lens performance over many decades. The principles have been understood for 150 years, and using ray-tracing software is stand
262.
by fsh 3y ago
Speakers are high-current, low-impedance loads. They won't pick up any significant noise, so shielding is entirely unnecessary.
263.
by fsh 3y ago
I find it a bit worrying how science-illiterate the some "tech" reporters appear to be (calling Nickel-63 "63 nuclear isotopes"). Also 50 Ci is an awful lot of activity to produce 100 µW. Being anywhere near a hypothetic
264.
by fsh 3y ago
The 737 NG from before the merger has a much better safety track record than the 737 MAX.
265.
by fsh 3y ago
There is no fundamental reason for car rental to be that awful. App-based free floating rental cars (think e-scooters, but with actual cars) are ubiquitous in large German cities and work extremely well. There are usually several free cars
266.
by fsh 3y ago
I think this concern is often vastly exaggerated. Even with current "dirty" production and transport, renewables have orders of magnitude lower lifetime emissions than fossil fuels. And this will only get better once production an
267.
by fsh 3y ago
TeX is a very arcane language, and it doesn't support floating point numbers. Few languages would be less suited for making a plotting library.
268.
by fsh 3y ago
Jerrold Zacharias produced a great video about the Stern-Gerlach experiment in 1967: https://www.youtube.com/watch?v=AcTqcyv-V1I
269.
by fsh 3y ago
Due to the apparent lack of crumple zones, it will probably also destroy its passengers on impact.
270.
by fsh 3y ago
I find Pgfplots quite hacky since TeX is really not made for handling data (it doesn't even support floating-point arithmetic). A much cleaner solution is to enable LaTeX text rendering in Matplotlib ( https://matplotlib.org&

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