jofer

41 ms·

361.
by jofer 9y ago
That's fair criticism. Let me rephrase the assumption: Can we assume that the same fundamental laws of physics are operating today as were operating in the past? If the laws of physics have changed, then yes, everything is out the wi
362.
by jofer 9y ago
The key in that case would be composition. Gyeser deposits are typically silica, and even when they're carbonate, they have a very distinct composition. Also, I doubt what you saw was related to a geyser. It's not impossible, bu
363.
by jofer 9y ago
It's a great question!! There are two key reasons from Hutton's era, and several others from the modern era. The first argument is what we see being formed today. Hutton was the original proponent of the principle of uniformitaria
364.
by jofer 9y ago
It is pumped, but the pumps are there to force circulation and keep things under control rather than to provide the pressure directly. You need a steady gradient of pressure. The pressure you need at the bottom of the hole will fracture th
365.
by jofer 9y ago
No boreholes are perfectly straight and vertical. In most cases, you're twisting the drillstring at the top, so it naturally "wants" to corkscrew. Furthermore, anisotropy in the rock causes things to deflect (deviate in dri
366.
by jofer 9y ago
Those are sidetracks. Sidetracking is done when there are problems with the borehole (it starts to collapse/deform or something gets stuck inside it) or different work needs to be done on a section (e.g. going back and coring a sectio
367.
by jofer 9y ago
Maybe I'm in the minority, but I've always found its syntax to be quite nice (though admittedly a departure from most modern languages). Then again, I find using JSON or not-quite-ruby to configure a build incredibly bizarre and
368.
by jofer 9y ago
You're right. There's a fair number of original examples there as well. Still, there's a lot of overlap.
369.
by jofer 9y ago
This is very similar in spirit to https://github.com/rougier/numpy-100/blob/master/100%20Numpy... . In fact, now that I look at it a bit more, it seems like all of this post's examples are reworded
370.
Who's Missing from America's Colleges? Rural High School Graduates(npr.org)
257 points by jofer 9y ago|295 comments
371.
by jofer 9y ago
What's really wild about this is that it's actually a strike-slip earthquake, based on the focal mechanism (e.g. https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3... ) Given how big it is, I&
372.
by jofer 9y ago
It looks like a graduate class. It's not expected that this is the first time someone in the course has come across most of the concepts and methods. The syllabus could almost be from an inverse theory class in my field (geology), albe
373.
by jofer 9y ago
Wait, I'm confused... LNG is pure methane. Are there rockets that use methane that aren't storing it as a liquid? I would have to guess that any rocket using methane would pressurize it enough to be in liquid form for storage, any
374.
by jofer 9y ago
Having given quite a few talks and even more posters, my experience is that you get to communicate on a _much_ deeper level with a poster. (Note: I'm not in CS. I'd imagine this varies a lot by field.) You get absolutely zero fee
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by jofer 9y ago
I've noticed the same thing, but I'm always surprised by it. Particularly with smartphones. A GPS is basically just a very, very precise clock and a radio receiver. Why don't smartphones use the GPS clock? I'm sure there
376.
by jofer 9y ago
Keep in mind that power outages in Houston were pretty rare and localized. Cell phone towers had power and the vast majority of homes had power (even a lot of the ones that were flooded, before it was explicitly cut off to flooded areas).
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by jofer 9y ago
If you publicize that, tons of other people evacuate, and the interstate system quickly becomes gridlocked. It's counter-intuitive, but every study and disaster plan for Houston has consistently called for shelter-in-place over calls
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by jofer 9y ago
The last time an evacuation was called for in Houston (Rita), over 100 people died trying to evacuate before the hurricane even hit. (e.g. https://en.wikipedia.org/wiki/Hurricane_Rita#Evacuation_deat... ) In terms of li
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by jofer 9y ago
To be fair, at every large company I've ever worked for (mostly major oil companies, not tech companies) it's at least a two to three month process.
380.
by jofer 9y ago
Rapideye and SkySat aside, Planet primarily operates a monitoring constellation, rather than a tasking constellation. The doves (satellites used to take this and the satellites being launched) are focused on imaging the land surface of the
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by jofer 9y ago
Another useful guide is Ben Root's Anatomy of Matplotlib tutorial: https://github.com/WeatherGod/AnatomyOfMatplotlib I'm a bit biased, as I wrote this particular section (most of the rest is Ben's work),
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by jofer 9y ago
Actually, you wouldn't get a signal from a sub going overhead with these. They're focused on recording relatively low-frequency response, so they don't pick up sound (hydrophones do a great job of that, and they're dirt
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by jofer 9y ago
There are a couple of reasons I'd argue it's best to avoid switching version control environments early on. 1. Integration with whatever build/issue tracking systems are present is worth preserving until you have the time to
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by jofer 9y ago
I agree with everything said, but I think they assumed a well-maintained and highly functionality legacy codebase. In my experience, there are a few steps before any of those. --- 1. Find out which functionality is still used and which fun
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by jofer 9y ago
The ship in the article is a drilling rig. What you're referring to a production platform. One is mobile and needs to sail around the world. The other is stationary and will stay in one place.
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by jofer 9y ago
If you're interested specifically in the petroleum side, I've heard "Introduction to Petroleum Exploration for Non-geologists" by Robert Stonely is good. There are probably more up-to-date books out there, though. For t
387.
by jofer 9y ago
In a nutshell, you're a long way from a sediment source. Most sediments by volume come from erosion of the continents or other landmasses. There's a much higher rate of deposition if you're near a continent (e.g. river delta
388.
by jofer 9y ago
The gravity-based methods require the ship track data as well -- they're not fully independent methods. (i.e. not only are they calibrated to it, ship-track bathymetry is actually half of the input data for gravity-derived bathymetry.
389.
by jofer 9y ago
Actually, they probably don't. The vast majority of the ocean hasn't been mapped with multibeam, civilian or military. Unless it's an area that's of strategic interest (i.e. mostly costal areas), it's very unlikely
390.
by jofer 9y ago
As a former exploration geologist on the petroleum side and marine geophysicist on the academic side - No, this data isn't very useful for petroleum exploration at all. Most of the deep ocean basins have absolutely zero oil. To create

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