Compounds and compositions of the following formula:and analogs and stereoisomers thereof. The roller vane pump has a fixed cam ring that has a rotor within. The method includes determining a projected source location, and determining a projected receiver location. In both cases, the resin is allowed to cure 3\u20134 hours. A gate insulating layer covers the semiconductor pattern. When it is desired to remove the clamp, the actuator can be reattached to the clamp and used to disengage the toothed retainer.