jofer

34 ms·

271.
by jofer 7y ago
Sorry I never noticed this! More or less any source of noise that's loud enough and is coupled to the ground works. In fact, a lot of what winds up being a good source is actually things like ocean waves -- not just man-made noise. Id
272.
by jofer 7y ago
Not such a great thing if you're doing ambient noise seismology, though! You win some, you lose some... (For background, you can also use the noise from trucks/etc as a seismic source to probe the structure of the subsurface. It
273.
by jofer 7y ago
That's a lot of film, you'd need a really really really big floor, and it'd be easier to make a duplicate set at that point. Also, as someone who spent a decade in grad school (short for my field, actually), I assure you that
274.
by jofer 7y ago
Yes, absolutely, but must people will misunderstand "speeding up" as increasing rate of rotation, which is why it's useful to clarify.
275.
by jofer 7y ago
I simplified. Some of it actually is consumed by friction (and therefore heating), too. You're correct that most is transferred. However, the angular rate of the Moon's rotation is staying the same over time (it's tidally loc
276.
by jofer 7y ago
That's the key part. We actually have good reasons (conservation of momentum) to believe that the revolution period does not change significantly over that timescale. There's nothing that should significantly change the momentum o
277.
by jofer 7y ago
The article doesn't say HDF5 isn't chunked, but that's the impression a reader might get if they don't already know better. It's certainly not the author's fault -- just an easy mistake for a reader to make wi
278.
by jofer 7y ago
There seems to be a common misconception that HDF5 somehow isn't chunked like zarray is... HDF5 will happily chunk things internally and treat them like a single large dataset. It's an index of chunks under the hood. It's
279.
by jofer 7y ago
Given nearby local ground-based correction stations (e.g. WAAS) it can use and flat terrain, yeah, you can certainly get that kind of accuracy. In practice, though, I've spent a fair bit of time trying to re-occupy sites taken with han
280.
by jofer 7y ago
That's not as accurate as you think unless you've got a full geodetic antenna. (i.e. $200k worth of equipment + a lot of permits to be allowed to have/use it) Getting to within +/- 30m doesn't help a ton when you&#
281.
by jofer 7y ago
Number one lesson: Don't bury stuff and expect to find it later. Seriously, folks. I grew up around a bunch of preppers and general outside-the-law folks. Burying things in ammo cans was kind of a pastime of a lot of people I knew. I
282.
by jofer 7y ago
Same here, though it helped a lot that we were in the middle of nowhere and going outside was very much an option when someone was on the toilet. Heck, I shared a house with 8 people in college that only had one bathroom... That was more of
283.
by jofer 7y ago
You don't actually sequester C02 in gaseous form when you do geologic carbon sequestration. First off, even the simplest methods wind up with it dissolved in water. You basically can't just inject gaseous C02 into the ground and h
284.
by jofer 7y ago
Enhanced recovery isn't carbon sequestration. You're not actually sequestering that much carbon with a C02 flood. That's not why oil companies tend to support CCS. CO2 is only useful for enhanced recovery in a few scenarios
285.
by jofer 7y ago
Sorry for the rant... I just feel like abstracts are the most important part of a paper and get annoyed with poor ones. A better abstract would arguably be something they have a few paragraphs into their introduction: "To construct hi
286.
by jofer 7y ago
I get more than a little annoyed with the advertising-like tone in this and several other articles around this general class of method/trick for speeding up complex simulations. It's not that it's not a useful method (it is).
287.
by jofer 7y ago
I'll second all of that. It's well worth actually learning C++ (and not C masquerading as C++) if you want to go into the broader scientific computing job market. I certainly wish I had focused more on "real" C++. I ha
288.
by jofer 7y ago
Numpy actually explicitly doesn't need fortran. It will use some fortran lapack libraries for optimizations if they're present, but it doesn't depend on fortran at all. Scipy is a different story. The need for a fortran compi
289.
by jofer 7y ago
I think you didn't read far enough... (See aliens questions later on) That having been said, I think it's fascinating that most of these questions are just that, but are impossible to answer at present. The probability space is ju
290.
by jofer 7y ago
First off, this borehole isn't that deep. Over the continents, you'd need to drill to 40-70km to reach the mantle (sometimes even 100km). However, oceanic crust is much thinner. It is technically feasible to drill into the mantle
291.
by jofer 7y ago
Well, "old style" isn't quite the right term, but 6-row is generally produces a bit lower percentage of fermentable sugars and has more proteins. It's not something you typically brew a beer with unless you're using
292.
by jofer 7y ago
For what it's worth, the defining characteristic of that style of beer (american pilsner) is being brewed with corn or rice. There's absolutely nothing wrong with using rice/corn in beer, anymore than there being something w
293.
by jofer 7y ago
> ...I have a personal theory that the overwhelming aroma and taste of hops in a beer can be used to mask many errors and missteps in the brewing process... For what it's worth, more hops absolutely masks errors in brewing. It'
294.
by jofer 7y ago
Use the scientific stack in python for that type of analysis. Yes, anything with one function call per item is going to be slow. That, along with memory inefficiency of lists, is the reason why numpy exists.
295.
by jofer 7y ago
Eventually! Don't rush on buying your future mountain view property, though. It'll take tens to hundreds of millions of years to happen.
296.
by jofer 7y ago
Interestingly, this earthquake is a key part of the evidence that a new subduction zone may be starting to form off the coast of Portugal. (E.g. Duarte et al, 2013 https://www.researchgate.net/profile/Joao_Duarte9/
297.
by jofer 7y ago
A key aspect that this misses is the target audience. The general public is not the target of most scientific visualizations. Instead, it's other scientists in the field. There are invariably lots of conventions and general historic
298.
by jofer 7y ago
Aren't those of us born in 1980 (+/- a year or so) millennials? I'm about the same age (38) and I guess I count myself as a millennial. I'm certainly considered a millennial by everyone older than me. I'd always hea
299.
by jofer 7y ago
Yeah, but that's part of the problem as well. Thermal stresses are very real and a big problem. You want as constant a temp as possible, that that's much easier to do with a reflective exterior than a non-reflective one.
300.
by jofer 7y ago
The issue with having sats be black is that black adsorbs a _lot_ of heat from the sun. Even more so with "better-than-vantablack". Cooling is actually a huge problem in space. It may be really cold, but it's extremely diffi

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