The present invention relates to transition metal compounds of the formula ,a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of at least one olefin in the presence of at least one of the catalyst systems according to the invention and the use of the ligand systems according to the invention for preparing transition metal compounds. Styrene derivatives containing carbazole, and homopolymers or copolymers of the styrene derivatives can be synthesized by the anionic polymerization method. The mold cover, the heat spreader and studs are molded and embedded with one another to form a single unit with improved torque strength and heat dissipation. A fault may also be detected by comparing the operating current to a scaled nominal current. In this way, interesting information about users’ actions outside of the domain of the social networking system may be shared and compared with other users on the social networking system. The fuel droplets leave the passage through its upper end defined by an annular sharp edge of a tubular electrode which can be electrostatically charged for the sharp edge to impart electrostatic charge to the fuel droplets as they pass the edge.