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We could have listed the units ( stories ) in the 10 hours of material designated for the 1997 evaluation and selected two random samples from this list . But because the LWRs are so much bigger - - nearly ten times the power output of all the reactors it was planning to build ( and nearly 400 times that of the reactor North Korea operated ) - - the two modern reactors KEDO is supplying could produce twice as many bombs worth of material as the reactors Pyongyang had under construction . Chemical and Process Engineering is concerned with the large scale physical or chemical transformation of material into valuable products . Publication is an important concept in copyright because , among other reasons , whether a work is published or not may affect the number of copies and the type of material that must be deposited when registering the work . In addition to treatment of a wide range of bound materials , responsibilities include examination and documentation of materials . This would facilitate keeping all your material maps files in a separate subdirectory and giving a Library_Path option to specify where your library of material maps are . Alex K-Y Jen , the Boeing / Johnson Professor of Materials Science and Engineering , a professor of chemistry and acting chair of the Department of Materials Science and Engineering . Exploration of fabrication using a number of materials , such as metal , wood , fabric , and objects , along with carving techniques in both traditional and non-traditional materials . For a listing of materials that have been found by the CFIA to be acceptable for use in food processing establishments , refer to the Reference Listing of Accepted Construction Materials , Packaging Materials and Non-Food Chemical Products .