A light emitting material includes a polyfluorene derivative having a liquid crystal side group is provided. The amplifier and sampling circuit is configured to sample data signals from the free fall sensor based on an initial sampling signal and based on a variable sampling signal. In a second open position, the piston is spaced from the vanes increasing the inlet nozzle area. Further, the modifier, prepared in either an emulsified form or as a fatty acid neat, facilitates formation of oxalate aggregates greater than 200 \u03bcm which may be readily screened out with minimum trihydrate loss. The second part includes an element having a hook-shaped extension and a shaft which is adapted to be engaged by the cradle. The visual preference terminology can be specified in a hierarchical structure providing a flexible and configurable interface to a radiographic system.