mchouza

8 ms·

1.
by mchouza 2y ago
They don't, see https://arxiv.org/abs/2309.07061 . The basic idea is to use "picosecond-level" synchronization to improve the signal-to-noise ratio. They mention that a truly phase-coherent swarm would p
2.
by mchouza 3y ago
Probably just converted from 1500 km.
3.
Does the Amazon provide 20% of our oxygen?(yadvindermalhi.org)
313 points by mchouza 7y ago|212 comments
4.
by mchouza 7y ago
I am quite confident all the current employees of OpenAI qualify as real people. They certainly have problems and probably a good share of those problems are "real" too. Of course their priorities may be off and they could be open
5.
by mchouza 10y ago
Many theoretical and experimental studies were done. One example from the early 70s is http://ipnpr.jpl.nasa.gov/progress_report2/II/IIO.PDF
6.
by mchouza 10y ago
That's true, but supersonic planes also travel higher (Concorde -> 18 km, XB-70 -> 22 km). The real problem is that L/D decreases at supersonic speeds. For example, the XB-70 had a L/D of about 7, while the 707 had a L&
7.
by mchouza 12y ago
It's mostly a question of power. The 1987 design for the TAU probe communication system would have handled 20 kb/s from 1000 AU... by using between 100 and 260 watts for the transmitter (and relatively big antennas): http:/&
8.
by mchouza 12y ago
Photons are generally considered to be their own antiparticles: http://van.physics.illinois.edu/qa/listing.php?id=27107
9.
by mchouza 12y ago
Japan has more than 1000 kg of HEU: http://www.nti.org/analysis/articles/civilian-heu-japan/
10.
by mchouza 13y ago
He is the first author cited in their paper: http://www.witricity.com/pdfs/highly-resonant-power-transfer...
11.
by mchouza 13y ago
It's already public: http://www.dawn.com/news/1077275/nsa-tapped-into-undersea-ca...
12.
by mchouza 13y ago
Oil can be produced synthetically: http://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_process Though the FT process is quite bad from a CO2 emissions POV.
13.
by mchouza 13y ago
No, the algorithm as described is very different from binary multiplication. It requires a number of stones proportional to the result, while the number of bits required when doing binary multiplication is polylogarithmic. It's a big d
14.
by mchouza 13y ago
https://www.google.com/patents/US4710876
15.
by mchouza 13y ago
You can launch from the ocean, though with more limitations: http://en.wikipedia.org/wiki/Sea_Launch
16.
by mchouza 13y ago
Maxwell didn't come up with anything himself [...] Maxwell "invented" the displacement current: http://en.wikipedia.org/wiki/Displacement_current
17.
by mchouza 13y ago
In the short run: - Ion thrusters are way simpler and they are trying to do something that is much easier. - Ion thrusters are relatively mature, working "fusors" don't exist. - Existing machines that are trying to get fusion breakeven are
18.
by mchouza 13y ago
Yes, I agree. My point was that you cannot do substantially better than ion engines without having energy gain and, in fact, you are probably going to do much worse due to the weight of the "fusion hardware". I'm quite optimistic about magn
19.
by mchouza 13y ago
Well, controlled fusion hasn't reached energy breakeven at all, even taking into account the kinetic energy of the reaction products. But the low thrust of current ion engines is mostly due to power restrictions ( https://groups.google.com/
20.
by mchouza 13y ago
If fusion doesn't provide a substantial energy gain, it's not worth the effort. Existing ion thrusters are quite efficient (60+%) at translating electrical power to exhaust kinetic energy.
21.
by mchouza 13y ago
Project Orion was much more than science fiction ( http://www.scribd.com/doc/28668567/Nuclear-Pulse-Space-Vehic... ) though it was much less than operational. Very big Orion spaceships would have used fusion explosions ( http://galileo.phys
22.
by mchouza 14y ago
Simulating explosions helps determine maintenance for nuclear warheads? It's not completely unreasonable: they need to validate the computational models that are used to check if an aged nuclear weapon will explode.
23.
by mchouza 14y ago
A more skeptical analysis by Phil Plait: http://blogs.discovermagazine.com/badastronomy/2011/10/17/di...
24.
by mchouza 14y ago
The basic idea is to ablate the asteroid to deflect it: https://e-reports-ext.llnl.gov/pdf/343984.pdf http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lare...
25.
by mchouza 14y ago
There are some places in the "natural universe" that are colder than the CMB. That's because they aren't in equilibrium: http://en.wikipedia.org/wiki/Absolute_zero#Very_low_temperat...
26.
by mchouza 14y ago
It's not as stupid as it seems. Due to the cosmic microwave background, the equilibrium temperature far from other natural radiation sources is about 3K. But, as we don't know the temperatures in the whole universe and there are natural pr
27.
Von Karman Lecture: Mars Science Laboratory's Bizarre Landing System(blip.tv)
1 points by mchouza 14y ago|0 comments
28.
by mchouza 14y ago
The puzzle can be found at http://meshcapital.com/application.tar.gz
29.
by mchouza 15y ago
You can try posting your question in http://cstheory.stackexchange.com/
30.
by mchouza 15y ago
The paper can be found here: http://www.eso.org/public/archives/releases/sciencepapers/es...

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