johnbcoughlin

7 ms·

31.
by johnbcoughlin 4y ago
The heat transfer is not (will not be) directly from the plasma to the water. The fusion neutrons will impact a "blanket", which is water-cooled, and kept at a temperature of around 600-800 C. Weakening of the pipes and all other
32.
by johnbcoughlin 4y ago
Converting water to steam is an extremely inefficient way to separate water from salt.
33.
by johnbcoughlin 4y ago
This is basically correct, the theory of distributions can be presented in terms of linear functionals. A functional is a map that takes a function and returns a scalar. I'm not sure how to encode linearity in your type system though..
34.
by johnbcoughlin 4y ago
Well, walking is hard for many people of course, but for most of them, mounting and dismounting a Segway would seem to be almost as hard.
35.
by johnbcoughlin 4y ago
Based on a few minutes of Googling, I think you're thinking of a plasma cutter which creates a closed circuit through plasma, through a cut line in the conductive material, and back to the machine. This seems to be just torches which s
36.
by johnbcoughlin 4y ago
Any orthogonal polynomial family can be combined into a simple tensor product basis. So in your case you could try T_1(x), T_1(y), T_1(x)T_1(y), T_2(x), T_2(x)T_1(y), and so on.
37.
by johnbcoughlin 4y ago
The post describes essentially a spectral method for solving ODEs in the Taylor (monomial) basis. Haskell definitely makes it nice to play around with this, but the monomial basis is terribly ill conditioned and not a good choice for this a
38.
by johnbcoughlin 4y ago
This is a great attitude to have if you're trying never to internalize any feedback at all.
39.
by johnbcoughlin 4y ago
I answered the GP based on my understanding of "closure" meaning different things for moment models vs turbulence. I think they're referring to energy partition scaling in saturated turbulence.
40.
by johnbcoughlin 4y ago
"closure" in the kinetics to fluid model context refers to a closed expression for the heat flux or anisotropic pressure in terms of the lower order fluid variables. You aren't really looking at a turbulence closure in the se
41.
by johnbcoughlin 5y ago
Addressing the first point: It certainly does make it faster on the happy path. Instruction cache performance is not a major concern when you're running in a tight loop.
42.
by johnbcoughlin 5y ago
The author has confused several mathematical concepts, unfortunately. - The double pendulum is a chaotic system, which means that starting states which are close together can quickly diverge. - This has nothing to do with nonlinearity as su
43.
by johnbcoughlin 5y ago
Perhaps because "universal access" is a piece of pablum that doesn't really mean anything, and certainly doesn't exculpate against the charge that someone wants to open the healthcare industry to private profits. For Twi
44.
by johnbcoughlin 5y ago
Why does pizza taste metallic to me when I eat it on a boat?
45.
by johnbcoughlin 5y ago
The article specifically notes that preschool age children have difficulty learning about 3D from a 2D screen.
46.
by johnbcoughlin 5y ago
The stability your example cites is stability of the amount of money you have and are making. Not to say that the other kind isn't a real thing people care about, but I don't think this is an example.
47.
by johnbcoughlin 5y ago
> the only real question is how much error you are willing to tolerate So, you are, in fact, gonna need an algorithm for summation that controls that error, if you're not willing to tolerate very much.
48.
by johnbcoughlin 5y ago
If you know about Lyapunov coefficients then you should also know about the concept of order of accuracy. If I'm developing a code that is supposed to be second order in time and space, then when I'm running my convergence study,
49.
by johnbcoughlin 5y ago
Hopefully everyone can see that there is a difference between being a 75% shareholder of Amazon, and being a 75% shareholder of dogecoin, in terms of the real assets that allows you to bring to bear. Regardless of which one is paying divide
50.
by johnbcoughlin 6y ago
The murderer was a lawyer who had appeared in her court, not a defendant.
51.
by johnbcoughlin 6y ago
If the whole process is capricious, it says a lot more about the company than about any individual interviewer.
52.
by johnbcoughlin 6y ago
The axiom holds for all numbers and all single operations. The final section presents a gotcha that arises when reasoning about the amount of _propagated_ error in certain calculations (called catastrophic cancellation). The "exact&quo
53.
The Fundamental Axiom of Floating Point Arithmetic(johnbcoughlin.com)
172 points by johnbcoughlin 6y ago|60 comments
54.
by johnbcoughlin 6y ago
it's not really dimensional analysis. the same methodology was used to estimate the Trinity blast.
55.
Debugging a dynamic linking bug in a Nix project(johnbcoughlin.com)
60 points by johnbcoughlin 6y ago|1 comments
56.
by johnbcoughlin 6y ago
I would suggest "gnash" as a much more appealingly playful alternative
57.
Diagnosing a 45 Second Test Startup(johnbcoughlin.com)
1 points by johnbcoughlin 6y ago|0 comments
58.
The Fundamental Axiom of Floating Point Arithmetic(johnbcoughlin.com)
4 points by johnbcoughlin 6y ago|0 comments