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The context of slow and volatile growth , currency misalignments , and trade imbalances may also undermine efforts to improve market access for the exports of developing countries . Devoted to increasing awareness of engineering , she works throughout the year speaking at local schools , participating in science and career fairs , and attending professional development seminars , all of which contribute to the education of the public about science , engineering , and technology careers . Boutilier engineered the mechanical systems for a 340,000 square-foot addition to the Baltimore County Detention Center integrating special security and life safety requirements . With his vivid use of color and juxtaposition of reality and imagination , the artist opens a new world of insights into the depth and breadth of engineering . 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 .