quadratic wave in a ring shape


I try to accomplish this kind of ring:

(The picture shows a side view of the ring.)

As you can see the quadratic waves are higher on top then on bottom, this very important for me.

Please advice me of how to accomplish this.

Thanks in advance.

arkashkin, are you sure? Quadratic wave in a ring shape?
Anything like this? http://www.pasteall.org/pic/show.php?id=89628
This was curve Circle initially.

as a texture or as a 2D or 3D model topo ?

happy bl