vhffm

5 ms·

1.
by vhffm 6y ago
You may be interested to know that both Maxwell's and the Einstein Field Equations can be derived by minimizing an action, cf. https://en.wikipedia.org/wiki/Einstein%E2%80%93Hilbert_actio... https://en.
2.
by vhffm 9y ago
There's a way of setting up a bare-metal (or VMs) cluster using Ansible. It may be the sort of 'easy in' you may be looking for: https://kubernetes.io/docs/getting-started-guides/fedora/fed...
3.
by vhffm 10y ago
There's a nice CUDA tutorial on DrDobb's. It may be slightly outdated by now, but it was a great help to get me started. http://www.drdobbs.com/parallel/cuda-supercomputing-for-the-...
4.
by vhffm 11y ago
Despite its name, it is in fact not a pension fund. http://www.nbim.no/en/the-fund/about-the-fund/
5.
by vhffm 11y ago
If you are interested in some of the details: The Navier-Stokes equations can be derived from the Boltzmann equation by applying a slight perturbation, expanding the result as a series, and taking the moments. Taking the moments is essentia
6.
by vhffm 11y ago
I'd like to point out that space is an extremely large and harsh environment. The three main issues: 1) Distances are huge. Light needs ~5 hours to travel from Pluto to Earth. This means high-gain (=large), directional antennas, and lo
7.
by vhffm 11y ago
There's an additional caveat that may be of interest. If you execute code in parallel, you may pick up different round-off errors unless you take care to combine the results from parallel tasks in the same order every time. This can be
8.
by vhffm 11y ago
For people wanting to go see a Buran, there's a prototype on display in a museum in (SW) Germany. http://speyer.technik-museum.de/en/spaceshuttle-buran
9.
by vhffm 11y ago
I'd like to point out that large-memory/many-core multi-user machines are very much alive in Computational Science (Computational Physics, Computational Chemistry, etc). Usually as test-beds (before deploying on clusters), visuali
10.
by vhffm 11y ago
Simulations may run for weeks or months on large computing clusters. People wanting the resulting data may not have suitable access and/or resource allocations to repeat the runs.
11.
by vhffm 11y ago
If Earth was travelling a bit slower, it would just be on different orbit. Either more eccentric or just further away from the sun. This is encapsulated in Kepler's laws [1], which describe the motion of a single planet around a single
12.
by vhffm 11y ago
It would not. If you start out with a velocity slightly slower than the Earth's, you end up with an elliptical orbit (instead of Earth's almost circular orbit). Barring some sort of drag (to further loose energy), there's no
13.
by vhffm 12y ago
I'm not in the business of space mission engineering, so I don't know details. Sorry. But in general, you can control the error and make a trade-off between computing time and accuracy. You would select a timescale over which you
14.
by vhffm 12y ago
It is a shortcoming of the integrator (Euler), not in the calculation of the force (as you suspected). See [1]. Especially slides 11 and 12 may be of interest. [1] http://www.astro.sunysb.edu/phy277/lect30.pdf As a sid
15.
by vhffm 13y ago
Only tangentially relevant, but he may be referencing this tweet: https://twitter.com/jakevdp/status/399982619242156032
16.
by vhffm 13y ago
This is great, thanks! Fyi, there's also screen-sharing (hover the mouse over your own window for the option), which works nicely (Chrome).
17.
by vhffm 13y ago
(Not Webdev, but Scientific Computing. Hope that's OK.) Another vote for the OSX + VirtualBox/Linux combo on a MacbookAir here. Gives all the shininess of OSX, battery time of MBA, with the (package managed) flexibility of a Linux