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| Euclidean Patterns in Non-Euclidean Tilings |
As we make changes, additions and fixes to the EPINET site, we'll post a note about them here.
With some assistance from routes in Rails, we now have nice urls for the Systre nets on epinet. They are of the form http://epinet.anu.edu.au/sqcNNN , where sqc specifies the class of net ('s'-Systre,'q'-surface class:cubic,'c'-orbifold class:Coxeter/Kaleidoscopic) and NNN is the unique number for that net. The primitive cubic lattice is sqc1 and sqc13519 is Faujasite.
We have expanded the Known Networks section, with help from Davide Proserpio and Vladislav Blatov, using the analysis package TOPOS with over 150 nets now identified from various online sources,including Mike O'Keeffe's Reticular Chemistry Structure Resource, the International Zeolite Association and Koch and Fischer's enumeration of homogeneous sphere packings.
We are starting to deploy AJAX features to expand and collapse content inline. This should make pages neater and more consise, without sacrificing the detail which is available on demand. First examples of this are in the s-net pages.
The main new addition to the site is the inclusion of VRML models of the equilibrium placement versions of most of the 3D networks, both as embedded VRML and in hyperlinks. Node colouring indicates symmetrically identical nodes.
The recommended cross-platform VRML browser plugin is the one from Cortona which even has a beta version for Mac OS X. One problem we've found with this Mac version, however, is that if you scroll the embedded window off the top of your browser, your client (Firefox, Safari) will start chewing up memory like crazy. Its not an issue if you use links to load models in full frame mode, just the embedded window, and only when its off screen.
More extensive data for the 3D networks will be forthcoming in the New Year as we make use Olaf Delgado-Friedrichs' Gavrog package. The project has its own website available here: Gavrog
There have been some enhancements and fixes to the Search functionality.
Tightened results delivered with the ONLY keyword in Tiling and Net valencies, with results for multiple targets being tighter, ie 5 4 ONLY will return all those having both 4 and 5 and no other.
There are several new changes to the EPINET website. Most significant is the renaming and ordering of the 3D Networks. The 14,532 networks arising from Systre analysis, of the 2D tilings of the cubic 3-genus minimal surfaces within the kaleidoscopic orbifold class are denoted by the three letter prefix 'sqc';
s: Systre
q: Cubic (P,G and D)
c: Coxeter (Kaleidoscopic)
This gives a simple naming scheme sqc(n) for n:1->14,532. Networks are sorted according to Systre key, first by length, then lexographically. The first representative is the primitive cubic lattice.
Other additions to EPINET include:
The EPINET website is launched! This is effectively “version 1.0” of the site, complete with access to the databases of 2D Tilings and 3D Networks as well as a simple 2D and 3D search facility.
In future releases we plan to expand the content available through the site as well as providing more ways to search and present it.
