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The coupled PDE system of a composite (sandwich) beam revisited
1.  Department of Mathematics, University of Virginia, P.O. Box 400137, Charlottesville, VA 22904 
In addition, however, through the aforementioned reduction to thermoelastic problems, we here establish new results for sandwich beams, when rotational forces are accounted for. They include: (i) a backward uniqueness property (Section 4), and (ii) a suitable singular estimate, critical in control theory (Section 5). Finally, we obtain a new backward uniqueness property, this time for a structural acoustic chamber having a composite (sandwich) beam as its flexible wall (Section 6).
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