dplavery92

10 ms·

31.
by dplavery92 5y ago
"as the Xenon built up" should read "as the Xenon burnt off*"
32.
by dplavery92 5y ago
>The Chinese are still struggling to successfully copy previous generation Russian designs This is certainly not true. If anything, the Chinese are very successfully copying current generation American designs. https://en.wik
33.
by dplavery92 5y ago
This is compounded by the fact that the boron control rods at Chernobyl were tipped with graphite (to increase volume/displacement at lower cost), so that when the reaction started to run away as the Xenon built up, the operators attem
34.
by dplavery92 5y ago
I don't think he did abstract it that way; it's one point in a more holistic picture of Zhu's firing, which largely speaks against Zhu's own assertion that [investors such as Shah and Bicer] would be more comfortable wit
35.
by dplavery92 5y ago
True, but it's an incident he only informed the board (including new board members) about in late 2020, and is one aspect of his communication with Bloomberg Business that the board told him to stop for 10 months before being terminate
36.
by dplavery92 5y ago
>especially in convolutional/correlation neural networks, which often make use of the convolution theorem to do the convolution Is this true? With the learned filters being so much smaller than the input imagery/signals, and w
37.
by dplavery92 5y ago
The fact that your previous 6 flips were all heads was an unlikely outcome, but the coin has no recollection of what just happened and doesn't "care" about the past when you flip it again. The maths term for this is to say
38.
by dplavery92 5y ago
That's strange, given that the Kelly criterion maximizes the expectation of the log of wealth--that is, it's maximizing over multiplicative percent gains in a scenario where you can go bankrupt.
39.
by dplavery92 6y ago
Personally I had grown out of that habit a semester or two before undergrad QM (though "Modern Physics" and "Experimental Physics" were another story...) but there were still some hangers on. Maybe 1-3 in a class of 20-
40.
by dplavery92 6y ago
I hard disagree with you, though I think there is something important about acknowledging what you'll ever be able to see with the naked eye. DSOs are going to be fuzzy white spots, no matter how much aperture you have. You will neve
41.
by dplavery92 6y ago
That's the lynchpin that guarantees Russia will retaliate, but it's Ripper's unchecked moments of control at SAC that set the whole ball rolling, and Slim Pickin's is cowboy-riding that bomb down to the ground whether Ru
42.
by dplavery92 6y ago
> Seems to me the field is wide open for someone to come in and solve it using off-the-shelf hardware. Solve what? You certainly wouldn't be the first to build a motorized tracking mount for astrophotography. There are plenty of ex
43.
by dplavery92 6y ago
> the thought of a Kubernetes cluster autonomously flying around with nukes scares the fuck out of me I get this, but I also wonder if the same kind of bugs or unintended behavior in a software system aren't just as likely in the p
44.
by dplavery92 6y ago
If you want to get into astrophotography, the phrase "entry-level" should probably not be in your vocabulary any more, though.
45.
by dplavery92 6y ago
Of course, optics are only half the battle. The other half is with the hardware all around them: plastic tripod leg clamps that slide, plastic baseplates that crack behind collimation screws, alt-az mounts that shake like a branch when you
46.
by dplavery92 6y ago
I think 6" is still pretty manageable for most people--you can probably fit it in the trunk of a sporty two-seater car. It's really only when you get to 10" and beyond--telescopes that are probably not a good "first sco
47.
by dplavery92 6y ago
This is the sort of thing where darker is always better, but John Dobson started a movement around "Sidewalk Astronomy" in the 60s and 70s in San Francisco with this very telescope design. I'm sure the light pollution has got
48.
by dplavery92 6y ago
I agree with this suggestion, but will add that you should get an affordable tripod to keep your image stable. (Your linked articles, of course, have plenty to add on this topic.) The lucky point here is that binoculars are small enough, l
49.
by dplavery92 6y ago
Telescopes need a mount and tripod (or Dobson-style mount) too! The price and barrier to entry with binoculars is smaller than any telescope you can't fit on your table top, and I think they're a great way to wet your feet and ma
50.
by dplavery92 6y ago
I'll glom on this only to add that while building your own reflecting telescope is valuable as a fun project or an educational exercise, you are unlikely to save much (if any) money doing it. A lot of John Dobson's "Sidewalk
51.
by dplavery92 6y ago
We may never actually know, but I have my doubts anything like that was ever fielded. You're talking about beam-expansion over thousands of km for a sat-to-sat weapon instead of the tens of km for the eventually de-funded ABL/YAL
52.
by dplavery92 6y ago
That sort of workflow sounds a lot like what you would get from a notebook like Jupyter, albeit you would have explicit block of code ("cells") to be executed together. It looks like Spyder now features Jupyter Notebook integratio
53.
by dplavery92 6y ago
>But saying that astrophysics is meaningful because some internet surveys find it to be "the sexiest job in the world", that's quite shallow. To the author's credit, I read that sentence the other way around: the inte
54.
by dplavery92 6y ago
I would call most of what was done in this presentation Photogrammetry https://en.wikipedia.org/wiki/Photogrammetry
55.
by dplavery92 6y ago
> expecting answers for questions that were asked and answered thousands of times before I don't mean to seem ungrateful for the work that open source maintainers do every day, but I think this sort of complaint is usually a symptom
56.
by dplavery92 6y ago
Yes, definitely. I'll edit the parent to reflect.
57.
by dplavery92 6y ago
Superconductivity is phenomenologically different than "very low resistance." The excitement about high-temperature superconductors is not only that there will be less power dissipated through power lines, but they will enable ne
58.
by dplavery92 6y ago
Because if you attempt to influence the state of the entangled bits--say, to set a bit to up/down (dot/dash or zero/one) state to form your message--you will break the entanglement. You can measure the states of the unpertur
59.
by dplavery92 6y ago
>Isn’t the state still a probabilistic one at that point though? As in it’s not until it’s observed later that both particles instantaneously collapse into a correlated state. But the precise outcome of the observation isn’t determined b
60.
by dplavery92 6y ago
While I would also not presume to know how different our understanding of the universe may look in hundreds (or thousands!) of years, I do draw some exception to the following comment: >Quantum entanglement, for example, breaks many of o

More ›