Physics as a Challenge.

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When not to use R squared

Ever wondered how relevant the R^2 value of any data series actually is? Sometimes, you see reasonably good coefficients of determination (depending on your scientific discipline and research question, "reasonably good" means something between...

2

Secure Plesk Webmail with SSL

Plesk 12.5 (together with the Let's Encrypt plugin) is a convenient tool that comes with batteries included for most cases. However, webmail is only accessible via SSL with the self-signed certificate by default. Some...

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Unrecognized DCD header in CP2K

DCD files are quite versatile but suffer from nearly non-existing documentation. They can hold atomic coordinates, velocities and forces - all designated by a different DCD file header: CORD, VEL, FRC. CP2K allows the...

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SSH: Where did I come from?

When you are frequently hopping between SSH hosts in different shells, you may forget which nodes you went through to actually get to the host you are on now. With the following changes, you...

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CP2K, where is my electron?

If you do unrestricted DFT calculations with CP2K for charged systems, you may wonder which spin channel the electron is taken from or added to. Moreover, the sign convention for any output (Hirshfeld or...

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Phusion Passenger and Django Deadlock

If you have the following symptom: You use Django and Phusion Passenger in at least version 4. A specific request is waiting forever. Restarting apache has no effect. Then you can check for the...