https://atmos.meteo.uni-koeln.de/ag_crewell/ 2026-04-30T07:07:53+00:00 https://atmos.meteo.uni-koeln.de/ag_crewell/ https://atmos.meteo.uni-koeln.de/ag_crewell/lib/exe/fetch.php?media=wiki:logo.png text/html 2021-01-22T21:17:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://atmos.meteo.uni-koeln.de/ag_crewell/doku.php?id=sites:joyce:qr-code&rev=1611350234&do=diff JOYCE QR-code A QR-code is the most abundant form of a 2D-barcode (wikipedia). QR-codes can be read by e.g. smartphone apps, programs or special scanners. They can provide text information but also links to websites, e-mail adresses, telphone numbers etc.