A water-soluble silicon-containing polymer is provided comprising recurring units having formula wherein 10\u2266m\u2266260, 1\u2266n\u2266100, X is an alkylene chain which may have an alkyl substituent, R is H, alkyl or acetyl, and \u201ca\u201d=1, 2 or 3. In particular, the invention provides for a method of introducing a supported metallocene-type catalyst system into a polymerization reactor by and in the presence of a carrier solution of an antistatic agent and a liquid diluent. The attachment means attaches the horizontal extension member and the socket to a vehicle window. A first pin of the connector carries a signal that indicates when the connector is connected to the first storage device, and a second pin carries a signal that indicates when the connector is connected to the second storage device. The dynamic spacer allows for accurately measuring flexion-extension gaps and angular deviation in flexion indicating the appropriateness of femoral rotation. In one aspect, the system may include at least one analysis module for receiving and analyzing an unknown work and generating a corresponding representation thereof, and at least one identification server for receiving the representation from the analysis modules and determining the identity of the unknown work.