You can view the latest batch of recent doctoral dissertations harvested from the issues 76-08 A and B of Dissertation Abstracts that pertain to the broad scope of the history of science at: http://www.hsls.pitt.edu/histmed/dissertations
ProQuest has altered how they put out their individual issues. No longer do they correlate to one month, so the dating is more random. Thus titles will range from 2016-yes they have some 2016 dates-back into the 1930’s.
Because ProQuest has begun downloading a large number of earlier dissertations from many institutions a decision has been made to only include titles going back to 2010 in this database. Anyone who wants the complete list of titles on this topic should email me directly at email@example.com and I will email you the full list.