Humidity sensors are generally designed to respond reversibly to changes in humidity. However, an irreversible response can be useful in certain applications, such as storage containers, for detection of past transient high humidity levels. In this work, an integrating humidity sensor has been fabricated by dispersing a desiccant (MgSO4) in a polymer film (polybutadiene). The sensor produces a large irreversible response, which can be used to passively monitor transient high humidity levels.

AbslraeLExplicit expressions for the eigenvalues of lhe single-qcle class-sums [ ( p ) ( l ) " -P ], , of the symmetric group (S,) are mnstnrcted in a manner which makes

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