evanb

53 ms·

571.
by evanb 7y ago
> You might not have heard much about NMR spectroscopy, but it's responsible for revealing details about the structure and dynamics of molecules - something that's incredibly handy for chemists and biochemists. Also it's t
572.
by evanb 7y ago
It wasn't just a matter of pointing a telescope at a lucky star. They had to invent new spectroscopic tools to find anything. Moreover, the avalanche of exoplanets their discovery heralded has changed questions fundamental to astronom
573.
by evanb 7y ago
If Bronx High School of Science (8 graduates have Nobels---7 physics, 1 chemistry) were its own country and we dramatically overestimate the total number of students who have graduated by multiplying current student population (about 900)
574.
by evanb 7y ago
This often happens, and it's why the committee distinguishes between splitting and sharing the prize. The first physics split by separate citations was 1903 Becquerel / Curie+Sklodowska-Curie, though their citation explicitly
575.
Every Programming Tutorial (parody) [video](youtube.com)
3 points by evanb 7y ago|0 comments
576.
by evanb 7y ago
It's not an adiabatic machine. It's a gate-type machine, with registers that experience programmable interactions with its neighbors. That's very much more like a classical computer than an adiabatic machine.
577.
by evanb 7y ago
This kind of decay requires an overall neutral current that changes the strange quark to a down quark. No such current exists at tree level in the Standard Model---instead, strange has to turn into an up-type quark and from there into a do
578.
by evanb 7y ago
They were closing due to the old age of the owner/operator, but he sold the method and apparatus to a company in South Korea who makes it in plentiful quantities now. Hagoromo.
579.
by evanb 7y ago
It's Hagomoro, mentioned in the second paragraph that it's now being made in South Korea. It's expensive but no longer at risk of extinction.
580.
by evanb 7y ago
Preprint: https://arxiv.org/abs/1909.06048
581.
Physicists close in on elusive neutrino’s mass(nature.com)
1 points by evanb 7y ago|0 comments
582.
by evanb 7y ago
I recently lived in Germany and was impressed by the security mandated there. In order to do anything of note (meaning where you could lose money) you were challenged to produce a TAN, one six-digit number from a one-time pad of ~100 that
583.
by evanb 7y ago
There was a company named Athelas mentioned here on YN too. I can't imagine it's a good idea. The Tolkien estate is notoriously rigid.
584.
by evanb 7y ago
The second law requires a generally-covariant extension. The statement is, roughly: in appropriate units, the sum of normal entropy and the area of black hole horizons is non-decreasing. See, for example, https://inspirehep.net&#
585.
New Miami Hurricane Hazard: Dockless Scooters as Projectiles(bloomberg.com)
1 points by evanb 7y ago|1 comments
586.
by evanb 7y ago
That's weird because 3 zillion is more than 28 zillion.
587.
by evanb 7y ago
The final state wavefunction, which you need to recover the initial state, contains an exponentially decaying distribution of different t2s. The final state wavefunction is not "here's a definite t2"---that requires measure
588.
by evanb 7y ago
Suppose you have a list of N numbers x_i, whose mean is X. The unaveraged variance, ∑_i (x_i - X)^2 is the sum of a bunch of squares, which are non-negative things, so the variance is non-negative. Now, we can expand the square
589.
DOE/NNSA, LLNL, Cray partner to develop NNSA's first exascale computer(llnl.gov)
1 points by evanb 7y ago|0 comments
590.
by evanb 7y ago
I went on this tour and can’t recommend it enough. Absolutely fantastic and extremely interesting. Pass on my congratulations to your friend!
591.
by evanb 7y ago
Last weekend was a terrible weekend for physics. Ann Nelson, an outstanding physicist at UW, also died in a mountaineering accident. https://physicstoday.scitation.org/do/10.1063/PT.6.4.2019080...
592.
by evanb 7y ago
This assumes you get to Svalbard the traditional way--by flight from the Norwegian mainland, in which case you need a passport to transit or depart the Schengen on the mainland side. If you arrive by some other means you do not.
593.
by evanb 7y ago
Yes. 45 inches per century would not have been remotely measurable at the time, and may not even be measurable today!
594.
by evanb 7y ago
The carbon goes back into the atmosphere if you burn it. If you just let it decay, turn into top soil, and ultimately become entombed by the surface of the Earth it will, ultimately, suffer the fate of most of the ancient plants we today b
595.
Ask HN: Do podcast ads depend on my IP address?
1 points by evanb 7y ago|2 comments
596.
by evanb 7y ago
Not quite. The stops are 33, 42, 51, 59, 68, 77, 86, 96, 103, which can also be read as ˚F. The exact conversions are (˚C) 0.555, 5.555, 10.555, 15, 20, 25, 30, 35.555, 39.444 (I terminated the decimal repetitions, obviously) The rule of th
597.
by evanb 7y ago
If you know the stops of the 6 train in Manhattan, the trick is that the stops are in Fahrenheit starting at 33rd street = 0˚ C. Each stop up town is +5˚C. Stays within 1˚C until 110th street.
598.
by evanb 7y ago
There may be New Yorkers who say it that way, but not this New Yorker, his family, or the traffic report he listens to.
599.
by evanb 7y ago
New York City just finished replacing the Kosciuszko Bridge, a critical segment of the BQE (I278). Most people in New York say "the koss-key-oss-ko bridge", though my understanding is that the pronunciation is more like "Ko-
600.
by evanb 7y ago
So, you want to abolish timezones? https://qntm.org/abolish

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