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Berens is also the Removable Media focal point for PPP & C in Rochester . The challenge was designing the facility to maintain the equipment using only robotic arms and other remote manipulators behind the safety of a 3-foot thick concrete wall . So , if you want to use a combination of fields which is not unique as a secondary key , you really do n't have to specify anything - just start retrieving by that combination ! David Youmans , a mechanical engineer with Green Mountain Engineering in San Francisco , California , develops cutting edge clean technologies ranging from solid hydrogen storage to passive solar trackers . ASME is a 120,000 - member , world-wide professional organization focused on technical , educational , and research issues of the engineering and technology community . He is assisting in the development of a number of prototype solar electric systems , a passive solar tracker , and a process for producing low cost photovoltaic cells .