A method for performing a position fix by a mobile terminal camped on a packet control channel is provided. A scaffold for bone growth comprises nanocrystalline hydroxyapatite, a bioresorbable plasticizer, and a biodegradable polymer. A vacuum is applied through an annular passage defined between the tubular body and the rotatable element. Therefore, the relay is nominally turned-on, even when little or no voltage is applied to the IP telephone substrate, as during the discovery mode of IP telephone operation. Temperature conditions of the electric drive system are monitored and torque of the electric drive system is limited based on the temperature conditions. In a second preferred embodiment, self-retaining, self-supporting structures are cast in situ in a suitable housing and can be used for size-based separations wherein the cast structure acts as a semi-permeable barrier.