hwillis

112 ms·

901.
by hwillis 7y ago
An anomaly in this case is defined as outside one standard deviation[1], so in a perfectly normal year you would expect ~15.9% of soil to be dryer than normal. [1]: http://edo.jrc.ec.europa.eu/documents/factsheets/
902.
by hwillis 7y ago
No, it's literally done with a log-normal distribution: https://www.hydrol-earth-syst-sci.net/12/1339/2008/hess-12-1... Log-normal is extremely common in hydrology. Turns out an anomaly in this case is
903.
by hwillis 7y ago
You mean mean, not average. Mean, median and mode are all averages. Only median splits into equal groups. The point I was trying to make though is that "normal" is not in any way equivalent to any kind of average. It always ref
904.
by hwillis 7y ago
Normal distribution of logarithmic dryness, then.
905.
by hwillis 7y ago
Given an expected normal distribution of soil dryness you can compare a given year's distribution. > Any distribution can define a normal range relative to that distribution. Any particular sample will always have a corresponding pr
906.
by hwillis 7y ago
Draught is an extremely noisy measurement. Because California got some unexpected but not unprecedented rain, draught on average is way down. However many parts of the US are also extremely abnormally dry- even if they aren't pushed
907.
by hwillis 7y ago
That's because its relative to location. The map tracks anomalies, not differences from a pan-european historical average single value.
908.
by hwillis 7y ago
Or the normal usage of normal, or the mathematical definition of normal: https://en.m.wikipedia.org/wiki/Normal_distribution
909.
by hwillis 7y ago
https://en.m.wikipedia.org/wiki/Normal_distribution Though given how much glsl I write, I appreciate that
910.
by hwillis 7y ago
No. Half of people are not taller than normal, they're taller than average.
911.
by hwillis 7y ago
You're the one who's defining normal badly. If you are told someone, or even all the people in a country, is/are "taller than normal", would you think they were all above 1.853 meters or whatever, or that they were
912.
by hwillis 7y ago
Cobalt yes, kind of. Nickel absolutely not. Every single car, globally, could be electrified without making a big dent in nickel demand. Stainless steel is FAR more demanding of nickel. Cobalt is tricky because in most places it's a
913.
by hwillis 7y ago
Goodenough didn't invent li-ion, he invented the cobalt oxide cathode that dominated the industry until nickel and iron cathodes came along. Goodenough is 97 years old and while he is still apparently sharp, he is not leading the lab t
914.
by hwillis 7y ago
> I wonder if there isn't some sort of governance solution to this. Like give companies big tax breaks for sharing their data with researchers, or something like that. Essentially subsidize academia indirectly. I think that's a
915.
by hwillis 7y ago
That's likely a myth. Even in space, cold welding doesn't happen under static loading: http://esmat.esa.int/Publications/Published_papers/STM-279.p... It requires impact of fretting, and even then there
916.
by hwillis 7y ago
The WHO estimates that 18% of cancers are caused by viruses: https://en.wikipedia.org/wiki/Oncovirus In general you'd think that viruses are good to avoid if you don't want cancer. Once they invade a cell
917.
by hwillis 7y ago
> Mill vise clamping surfaces are ground flat. It's normal for an object that's at least cut (not even ground) flat on one side to get hydraulically suctioned via cutting oil to either of these. It's usually easy to slide
918.
by hwillis 7y ago
Note that this is a big oversimplification- it doesn't apply to gage blocks. Cold welding and similar phenomenon can only truly happen with metallic bonds and very large grain sizes. Non-metallic bonds are structured and require prec
919.
by hwillis 7y ago
Casimir forces are probably involved- gage blocks work with flatness/separation (tens of nanometers) that is too high for intermolecular attraction (hundreds of picometers). Casimir attraction works at longer distances, but it's
920.
by hwillis 7y ago
I figured- Perth is in Australia. If you're in Mexico you're pretty screwed, as is... South America, Africa, and most of Asia. You can check the map if you like! https://www.tesla.com/findus?v=2&bounds=67.510
921.
by hwillis 7y ago
I've wanted this for a while, in combo with a head-tracking cabin camera. That way the windscreen would tint in specific areas over the sun, oncoming headlights, and glare. You can't use LCs, as they don't have a real "
922.
by hwillis 7y ago
Even on constant full blast with the smallest battery Tesla sells, it's only gonna use ~2-3% per hour. Over 8 hours that would be 44 miles off the 220 mile range. > but it is probably the only reason I'm considering a Tesla if
923.
by hwillis 7y ago
That's for a belt-driven A/C, tied directly to the engine RPM. They're inherently much less efficient because they have to work over a wide range of speeds. A motor-driven A/C will be 1-2 kW. That's also the peak
924.
by hwillis 7y ago
Window units range from 700 W to 2+ kW. The Model 3 has a pretty powerful one, at least 1 kW. That's peak draw, and it'll turn on and off intermittently[1]. Average draw should work out to 200-300 watts for medium. [1]: Like a
925.
by hwillis 7y ago
> The extended range is nice and all, but if somebody makes a car that can run the AC without running/draining the battery while it's parked, even if it's just a little to keep the car interior at 35°C or so, I would, with
926.
by hwillis 7y ago
> With the rise of China and its exponential military spendings, do you think that decreasing us military budget would be a wise strategic move ? The budget is essentially unchanged[1]. The value of that budget has increased exponenti
927.
by hwillis 7y ago
Just don't touch the basin area in the bottom!
928.
by hwillis 7y ago
It probably also makes sense to do it in an environment with lots of reflections of different kinds. If you were genuinely worried about your primary sensor getting bad data, you definitely wouldn't test four of them together in the r
929.
by hwillis 7y ago
I had another comment focused more on the historical state: https://news.ycombinator.com/item?id=20182159 The tl;dr is that market forces led to early electric cars being slow and expensive- they were luxury vehicles primar
930.
by hwillis 7y ago
That wasn't the part that I had any complaints about, although it's not the real reason electric cars didn't win: https://news.ycombinator.com/item?id=20182159

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