The following databases contain articles and research papers, conference publications, textbooks, material and chemical properties and general reference materials. They are considered comprehensive and interdisciplinary and a good place to start a new research project:
You can reliably search for many recent US government reports from labs like the National Renewable Energy Lab in BruKnow. Search the name of the report title and/or the author's name to locate the item in the catalog. The Library may also have some older technical reports in print at the Annex. Search by title, author, lab name, or report number to find and request the item.
There are many different repositories for technical reports produced by governments, international agencies, NGOs, and research institutions. If you can't find the technical report you are looking for in an online repository, you can request it using the Library interlibrary loan service.