cbkeller

68 ms·

331.
by cbkeller 8y ago
> In the absence of reliable extensional rheology data, we can only point to the fact that when cats are deformed along their principal axis, they tend to relax more easily, suggesting that the extensional time is smaller than the shear
332.
by cbkeller 8y ago
According to the Julia benchmarks (and I assume Julia folks are relatively unbiased re: C vs Fortran), it depends on the algorithm [1], but less than an order of magnitude in either direction. I'm kinda surprised Fortran doesn't d
333.
by cbkeller 8y ago
Interesting, I haven't tried that. Apparently it uses either MPI or GASNet for the between-node communication, depending on configuration? I don't know anything about the latter, but apparently it's an LBL product [1]. [1]
334.
by cbkeller 8y ago
Better than? Not necessarily disagreeing, but I'm not sure what the alternatives even are at the same level of abstraction. I mean, there's PNNL's global arrays [1] but that's higher level, or Sandia Portals [2] which is
335.
by cbkeller 8y ago
Hah, I hadn't heard that! My impression has been that good C++ written for HPC tends to look a lot like plain C anyways. And ccall is pretty efficient, so I'm not complaining there either.
336.
by cbkeller 8y ago
That's a good point. Hierarchical parallelism is becoming increasingly important, so having one language that can be used both within-node and between-node is very convenient, and could add to the lock-in factor.
337.
by cbkeller 8y ago
Definitely still scientific computing ("formula translator" after all). In particular it's still frequently used in the supercomputing/HPC space for large parallel numerical simulation codes. The issue with optimizabili
338.
by cbkeller 8y ago
I've done a bit of HPC work, and Fortran is very much "still a thing" there. MPI[1] is pretty much the only game in town for between-node parallelism, and MPI comes with interfaces for C, C++ and Fortran. The only other langu
339.
by cbkeller 8y ago
Ah, thanks! edit: do you think Legros et al. agree with that interpretation, or is the Quanta magazine -> Atlantic -> nextbigfuture article just using the Legros paper as an excuse to bring up the "holographic duality" views
340.
by cbkeller 8y ago
It's not surprising that Planck's constant is important here, but this seems to have much more to do with crystallographic vacancy "holes" than anything even tenuously related to black holes or cosmology. I'm no phy
341.
by cbkeller 8y ago
Geologist here. This reminds me of the previous story about massive paleoburrows (also in Brazil) that are thought to have been dug by extinct giant ground sloths [1,2]. The geological background for both of these stories seems to be that c
342.
Cracking the Cambrian(science.sciencemag.org)
1 points by cbkeller 8y ago|0 comments
343.
by cbkeller 8y ago
In the very simplest form, because there's a large class of people for whom "We're being attacked by Soros" translates directly to "We're being attacked by a massive globalist (read: Jewish) cabal", and Fa
344.
by cbkeller 8y ago
The "legalistic gambit" is definitely a real thing. I've just learned the other day that there's a neologism for this: "sealioning" [1], defined as > pursuing people with persistent requests for evidence or
345.
by cbkeller 8y ago
If we want to be technical, I think there's also an argument to be made that moderation of online forms is a hard problem that "good hackers would find interesting" which would arguably satisfy the guideline that > On-Topi
346.
by cbkeller 8y ago
Sounds like navigation might be different, but the linked page is a bit cryptic: > Fast, precise cursor movement without repetitive keystrokes or fancy expressions. Look where you'd like to move, and type the token. That's it.
347.
by cbkeller 8y ago
Ok, so I could imagine rent control would work fine in (e.g.) the bay area if there was also (1) Government-built (or heavily subsidized) housing to get around the fact that rent control limits the capitalist demand for new housing (2) Stro
348.
by cbkeller 8y ago
Well, for one thing there was no telecommunication, so most people may not have known it was a global event.. people (outside of the range where it was entirely ear-shattering) may have just thought "huh, I guess they're firing th
349.
by cbkeller 8y ago
That's a good question. Someone else may be more qualified, but here's a start. For one thing, the answer will be a bit be different in marine vs. terrestrial ecosystems. Nitrogen limitation is one common one, which can apply eith
350.
by cbkeller 8y ago
Woah woah woah, hold up. Geologist here. The effects of Milankovitch cyclicity and tectonics on climate are entirely mediated through the atmosphere .
351.
by cbkeller 8y ago
That's a cool study. CO2 fertilization is a real phenomenon (with some caveats, which I pointed out some of), but I stand by the characterization that it is misleading to use this to suggest that we shouldn't be concerned about
352.
Google’s “Smart City of Surveillance” Faces New Resistance in Toronto(theintercept.com)
3 points by cbkeller 8y ago|0 comments
353.
by cbkeller 8y ago
> dare not say them because they need grants Without trying to get into a flame war here, this claim is very iffy. As a scientist myself, there's (for better or worse) nothing better to make a career out of than showing where other
354.
by cbkeller 8y ago
> "Well, the rate at which we're injecting CO_2 into the atmosphere today, according to our best estimates, is ten times faster than it was during the End-Permian. And rates matter. So today we're creating a very difficult
355.
by cbkeller 8y ago
Woah, I learned something today! Nice references.
356.
by cbkeller 8y ago
Well said. Yes, if you provide unlimited water, N, P, and light in a greenhouse then of course CO2 becomes limiting, it's the only thing left!
357.
by cbkeller 8y ago
Geologist here. This is misleading. Yes, CO2 is what plants eat, but it doesn't tend to be the limiting nutrient very often on Earth today. For the ocean (where 50-85% of photosynthetic oxygen production, and equivalently carbon burial
358.
by cbkeller 8y ago
> We don't need more of them > 500 person lecture halls I love evidence-based pedagogies like active learning, which are demonstrably better for most students than "medieval style" lectures. I would like to be able to t
359.
by cbkeller 8y ago
More references: [1] semi-recent nytimes article on same topic [2] physiological effects of microwave radiation [1] https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba... [2] https://
360.
by cbkeller 8y ago
Wouldn't be surprised if someone has determined the cause and just hasn't publicized it.. There were some comments on an older ars technica article which I thought made a pretty good case for EM.

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