18:46 Oct 26, 2011 

"Aspect ratio" in Aviation, is the ratio between wing span and wing chord ("width"). Therefore, I guess that another translation -more suitable in this context- would be "esbeltez".

However, I cannot see any "esbeltez" for the anisotropy, which, if memory serves me properly, means that the properties of the object are different across, along and in-depth. And I am not even sure that this does not refer to any software, where I would be out of my depth.

More context seems essential to me.