In one aspect, an apparatus for use in a wellbore is provided that may include: a tool configured to be conveyed into the wellbore by a conveying member; and an electro-active polymer device configured to connect the tool to the conveying member when the EAP device is in a first mode or position and disconnect the tool from the conveying member when the EAP device is in a second mode or position. The mobile communication terminal receives radio signal from a communicating base station and a neighboring base station, and measures received radio signal quality. Thus the rotary detector is prevented from being damaged or deformed due to shocks. The techniques can be useful for determining wall thickness, which can be used to classify polyp candidates, diagnose diseases of the colon, and the like. The contents of a block of the assemblage may then be transferred into a next block. The cover is formed of a cover stock comprising an ionomer resin and an inorganic filler.