Systems and methods for performing clustering of a document image are disclosed. The compound also has one or more cyclophosphazene rings attached to or incorporated into the backbone. In one embodiment, each access control policy contains extensions which can direct an access controller to selectively enable or disable various access control policies upon authorization of an access request. The adjusting signal is produced based upon a comparison between the primary signals the reference signals. The precipitating device is connected with a bias high voltage for adsorbing ionized particles. This technique can be employed to cut a variety of materials with a variety of different lasers and wavelengths.