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So we are asking our peer societies to make donations to EWB . The main difference between multiversion and lock models is that in MVCC locks acquired for querying ( reading ) data do n't conflict with locks acquired for writing data and so reading never blocks writing and writing never blocks reading . It is now conceded that the debt sustainability analysis so far undertaken has proven to be too optimistic , even for countries reaching completion point . As a civil engineer , Fischer has been called to emergencies ranging from assessing the safety of a building following a fire to determining a repair scheme for a tornado-ravaged structure to investigating structural damage from an explosion . While still in school at the University of California San Diego Youmans was part of a student team that designed a cervical traction device for treating patients with ruptured intervertebral disks .