Hi Rick,
Yes you can access Science Direct through this link: http://leo.lib.unomaha.edu/login?url=http://www.sciencedirect.com
You will be prompted to sign in with your library account. If you haven't set that up yet, I've attached instructions for you.
You can still seartch for journal titles in the catalog though. From the library's homepage, type the journal title in the box highlighted and click GO:
From the results page on the lefthand side, check the "Journal, Magazine" box to limit to just periodicals, as shown below.
If you have other questions just let us know. Have a good day!
Danielle S.