My major is Physics + EE

I got my GC through NIW last year. I think as long as you have some publications and your research is applied to some US companies, you can safely say it benefits US economy in national scope because it helped US to increase its competitive advantage in global IT industry. If you want you can go to http://www.hotdogjob.com/forum/viewtopic.php?t=227. I put some of my old articles there, my experience there might be helpful.