Science Conference Proceedings (U.S. Dept of Energy) identifies "science and technology conference proceedings and conference papers from a number of authoritative sites (professional societies and national labs, largely) whose areas of interest in the physical sciences and technology intersect those of the Department of Energy. Proceedings and papers from scientific meetings can be found in these fields, among others:
Science Accelerator (U.S. Dept of Energy) "empowers you to search, via a single query, important information resources of the U.S. Department of Energy's (DOE's) scientific and technical information.
WorldWideScience.org - The Global Science Gateway "is a global science gateway connecting you to national and international scientific databases and portals. WorldWideScience.org accelerates scientific discovery and progress by providing one-stop searching of global science sources."
NOTE: Before you pay to purchase an article or report identified by WorldWideScience.org, check with the UCF Libraries regarding whether or not it is available through a library subscription or through Interlibrary Loan.