For providing a service-centric approach to allocating computing service power to users in a heterogeneous distributed computing environment such as a grid, a grid service broker comprises a central service broker and distributed service brokers. A method of manufacturing a three-dimensional netted structure using the apparatus by extruding molten filaments of a thermoplastic resin downward from the dies via the mouthpiece, helically entangling the molten filaments by entangling actions of the endless members, and cooling the entangled filaments in a liquid in the tank. In other embodiments, the invention includes a process for the manufacture of a hydrocarbon pyrolysis product from a hydrocarbon feed using a regenerative pyrolysis reactor system, comprising the steps of: heating a pyrolysis reactor comprising a bi-modal stabilized zirconia ceramic component to a temperature of at least 1500\xb0 C. The source of the high-voltage NMOS transistor is connected to the drain of the low-voltage NMOS transistor.